JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Optical activity of an enantiomeric mixture is $ +12.6^\circ $ and the specific rotation of $ (+) $ isomer is $ +30^\circ $. The optical purity is _______ $ \% $.

Which of the following is metamer of the given compound $( X) $?

The technique used for purification of steam volatile water immiscible substances is:

Which among the following is the strongest acid?

The order of relative stability of the contributing structure is:

Choose the correct answer from the options given below:

What is the correct IUPAC name of ?

$ 0.25 \, \text{g} $ of an organic compound “A” containing carbon, hydrogen and oxygen was analyzed using the combustion method. There was an increase in mass of $ \mathrm{CaCl_2} $ tube and potash tube at the end of the experiment. The amount was found to be $ 0.15 \, \text{g} $ and $ 0.1837 \, \text{g} $, respectively. The percentage of oxygen in compound A is ______ $ \% $. (Nearest integer)
(Given: molar mass in $ \text{g mol}^{-1} $ H : $ 1 $, C : $ 12 $, O : $ 16 $)

Arrange the following alkenes in decreasing order of stability.

Choose the correct answer from the options given below:

The decreasing order of hydride affinity for following carbocations is:

Choose the correct answer from the options given below:

10.

Which one of the carbocations from the following is most stable?

11.

Among the following compounds, the one which shows highest dipole moment is:

12.

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of:

13.

Total number of sigma $ (\sigma) $ ______ and pi $ (\pi) $ ______ bonds respectively present in hex-1-en-4-yne are:

14.

Total number of aromatic compound among the following compounds is ___________.

15.

In the following structures, which one is having staggered conformation with maximum dihedral angle?

16.

Match List - I with List - II.

List – I Pair of Compounds	List – II Type of isomers
A. 2-Methylpropene and but-1-ene	I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene	II. Position isomers
C. 2-Butanol and diethyl ether	III. Chain isomers
D. But-1-ene and but-2-ene	IV. Functional group isomers

Choose the correct answer from the options given below:

17.

Number of $ \sigma $ and $ \pi $ bonds present in ethylene molecule is respectively:

18.

The total number of 'Sigma' and 'Pi' bonds in $ 2 $-formylhex-$ 4 $-enoic acid is __________.

19.

The total number of chiral compound/s from the following is _________.

20.

The functional group that shows negative resonance effect is:

21.

Which one of the following compounds is aromatic in nature?

22.

Relative stability of the contributing structures is:

23.

Given below are two statements :
Statement-I : Ethyl pent-$ 4 $-yn-oate on reaction with $ \mathrm{CH_3MgBr} $ gives a $ 3^\circ $-alcohol.
Statement-II : In this reaction one mole of ethyl pent-$ 4 $-yn-oate utilizes two moles of $ \mathrm{CH_3MgBr} $.
In the light of the above statements, choose the most appropriate answer from the options given below:

24.

The correct order of stability of following carbocations is:

25.

The maximum number of $ \mathrm{RBr} $ producing $ 2 $-methylbutane by above sequence of reactions is _________. (Consider the structural isomers only)

26.

Arrange the following conformational isomers of n-butane in order of their increasing potential energy:

27.

Given below are two statements.
Statement I: The presence of weaker $ \pi $- bonds make alkenes less stable then alkanes.
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

28.

$ 2.0 \, \text{g} $ of a bromo hydrocarbon $ (X) $ was subjected to Carius analysis, gave $ 3.36 \, \text{g} $ of $ \text{AgBr} $. The percentage of carbon in the compound $ (X) $ is $ 26.7\% $. Total number of carbon atoms in the empirical formula for compound $ (X) $ is ________. (Given molar mass in $ \text{g mol}^{-1} $ $ \text{H}: 1, \text{C}: 12, \text{Br}: 80, \text{Ag}: 108 $)

29.

In Dumas' method for estimation of nitrogen, $ 0.5 \, \text{gram} $ of an organic compound gave $ 60 \, \text{mL} $ of nitrogen collected at $ 300 \, \text{K} $ temperature and $ 715 \, \text{mm Hg} $ pressure. The percentage composition of nitrogen in the compound (Aqueous tension at $ 300 \, \text{K} = 15 \, \text{mm Hg} $) is __________$ \% $.

30.

Given below are two statements:
Statement I: Hyperconjugation is not a permanent effect.
Statement II: In general, greater the number of alkyl groups attached to a positively charged C-atom, greater is the hyperconjugation interaction and stabilization of the cation.
In the light of the above statements, choose the correct answer from the options given below:

31.

Find out the statements which are not true.
(A) Resonating structures with more number of covalent bonds and lesser charge separation are more stable.
(B) In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E effect with electrophile.
(C) Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.
(D) The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.
(E) Stability of carbanion increases with the increase in s – character of the carbon carrying the negative charge.
Choose the correct answer from the options given below:

32.

A solution of $ \mathrm{FeCl_3} $ when treated with $ \mathrm{K_4[ Fe(CN)_6 ]} $ gives a prussian blue precipitate due to the formation of:

33.

From the following, the least stable structure is:

34.

In base vs. acid titration, at the end point methyl orange is present as:

35.

Total number of optially active compounds from the following is _____________.

36.

The correct IUPAC name of the following compound is:

37.

The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is:

38.

Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is:

39.

From the figure of column chromatography given below, identify incorrect statements.

A. Compound ‘c’ is more polar than ‘a’ and ‘b’
B. Compound ‘a’ is least polar
C. Compound ‘b’ comes out of the column before ‘c’ and after ‘a’
D. Compound ‘a’ spends more time in the column
Choose the correct answer from the options given below.

40.

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flower is:

41.

The adsorbent used in adsorption chromatography is/are:
A. silica gel B. alumina C. quick lime D. magnesia
Choose the most appropriate answer from the options given below:

42.

The complete combustion of $ 0.492 \, \text{g} $ of an organic compound containing $ \text{‘C’, ‘H’ and ‘O’} $ gives $ 0.793 \, \text{g} $ of $ \mathrm{CO_2} $ and $ 0.442 \, \text{g} $ of $ \mathrm{H_2O} $. The percentage of oxygen composition in the organic compound is ______ (nearest integer)

43.

In an estimation of sulphur by Carius method $ 0.2 \, \text{g} $ of the substance gave $ 0.6 \, \text{g} $ of $ \mathrm{BaSO_4} $. The percentage of sulphur in the substance is ______ $ \% $.
(Given molar mass in $ \text{g mol}^{-1} $ $ \mathrm{S} : 32 $, $ \mathrm{BaSO_4} : 231 $ )

44.

The correct IUPAC nomenclature for the following compound is:

45.

Which of the following statements are correct?
A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.
B. Aniline can be purified by steam distillation as aniline is miscible in water.
C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.
D. An organic compound is pure, if mixed M.P. is remain same.
Choose the most appropriate answer from the options given below:

46.

In Carius method for estimation of halogens $ 0.2 \,\text{g} $ of an organic compound gave $ 0.188 \,\text{g} $ of $ \mathrm{AgBr} $. The percentage of bromine in the compound is __________. (Nearest integer) [Atomic mass: $ \mathrm{Ag} = 108 $, $ \mathrm{Br} = 80 $]

47.

Which among the following is incorrect statement?

48.

Using the given figure, the ratio of $ R_f $ values of sample A and sample C is $ x \times 10^{-2} $. Value of $ x $ is $ \_ \_ \_ \_ \_ $.

49.

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

50.

In Dumas' method for estimation of nitrogen $ 1 \,\text{g} $ of an organic compound gave $ 150 \,\text{mL} $ of nitrogen collected at $ 300 \,\text{K} $ temperature and $ 900 \,\text{mm Hg} $ pressure. The percentage composition of nitrogen in the compound is ________ $ \% $  (nearest integer).   $ (\text{Aqueous tension at } 300 \,\text{K} = 15 \,\text{mm Hg}) $

51.

Which one among the following resonating structures is not correct?

52.

Total number of nucleophiles from the following is:

53.

Which of the following is an aromatic compound?

54.

The major product of the following reaction, if it occurs by $ \mathrm{S_{N}2} $ mechanism is :

55.

The molecular formula of second homologue in the homologous series of mono carboxylic acid is:

56.

Given below are two statements:
Statement-I: Sublimation is used for the separation and purification of compounds with low melting point.
Statement-II: The boiling point of a liquid increases as the external pressure is reduced.
In the light of the above statements, choose the correct answer from the options given below:

57.

The IUPAC name of the following compound is:

58.

120 g of an organic compound that contains only carbon and hydrogen gives 330 g of $\text{CO}_2$ and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are:

59.

Which one of the following will show geometrical isomerism?

60.

The correct nomenclature for the following compound is:

61.

IUPAC name of following compound $ (P) $ is :

62.

The dihedral angle in staggered form of Newman projection of $ 1, 1, 1, $-Trichloro ethane is _____ degree. (Round off to the Nearest Integer).

63.

Nitrogen can be estimated by Kjeldahl’s method for which of the following compound ?

64.

$ \mathrm{CrCl_3.xNH_3} $ can exist as a complex. $ 0.1 $ molal aqueous solution of this complex shows a depression in freezing point of $ 0.558^\circ \text{C} $. Assuming $ 100\% $ ionisation of this complex and coordination number of $ \mathrm{Cr} $ is $ 6 $, the complex will be (Given $ K_f = 1.86 \, \text{K kg mol}^{-1} $ )

65.

An organic compound is subjected to chlorination to get compound $ A $ using $ 5.0 \, \text{g} $ of chlorine. When $ 0.5 \, \text{g} $ of compound $ A $ is reacted with $ \text{AgNO}_3 $ [Carius Method], the percentage of chlorine in compound $ A $ is ________ when it forms $ 0.3849 \, \text{g} $ of $ \text{AgCl} $. (Round off to the Nearest Integer) (Atomic masses of Ag and Cl are $ 107.87 $ and $ 35.5 $ respectively)

66.

Match List - $ \text{I} $ with List - $ \text{II} $.

Choose the correct answer from the options given below:

67.

Given below are two statement:

In the light of the above statement, choose the most appropriate answer from the options given below.

68.

Total number of compounds with Chiral carbon atoms from following is __________ .

$\text{CH}_3 - \text{CH}_2 - \text{CH}(\text{NO}_2) - \text{COOH}$
$\text{CH}_3 - \text{CH}_2 - \text{CHBr} - \text{CH}_2 - \text{CH}_3$
$\text{CH}_3 - \text{CH}(\text{I}) - \text{CH}_2 - \text{NO}_2$
$\text{CH}_3 - \text{CH}_2 - \text{CH}(\text{OH}) - \text{CH}_2\text{OH}$

69.

Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.
Assertion A: $ [6] $ Annulene, $ [8] $ Annulene and cis-$ [10] $ Annulene, are respectively aromatic, not-aromatic and aromatic.

Reason R: Planarity is one of the requirements of aromatic systems.
In the light of the above statements, choose the most appropriate answer from the options given below:

70.

In the sulphur estimation, $ 0.20 \, \mathrm{g} $ of a pure organic compound gave $ 0.40 \, \mathrm{g} $ of barium sulphate.
The percentage of sulphur in the compound is __________ $ \times 10^{-1} \% $.
(Molar mass : O $ = 16 $, S $ = 32 $, Ba $ = 137 $ in g mol$^{-1}$)

71.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Thin layer chromatography is an adsorption chromatography.
Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.
In the light of the above statements, choose the correct answer from the options given below:

72.

Observe structures of the following compounds

The total number of structures/compounds which possess asymmetric carbon atoms is __________.

73.

‘Adsorption’ principle is used for which of the following purification method?

74.

Match List I with List II:

List I (Element detected)	List II (Reagent used/Product formed)
A. Nitrogen	I. $ \text{Na}_2[\text{Fe}(\text{CN})_5\text{NO}] $
B. Sulphur	II. $ \text{AgNO}_3 $
C. Phosphorous	III. $ \text{Fe}_4[\text{Fe}(\text{CN})_6]_3 $
D. Halogen	IV. $ (\text{NH}_4)_2\text{MoO}_4 $

Choose the correc answer from the options given below:

75.

Using column chromatography, mixture of two compounds ‘A’ and ‘B’ was separated. ‘A’ eluted first, this indicates ‘B’ has:

76.

The interaction between $ \pi $ bond and lone pair of electrons present on a adjacent atom is responsible for:

77.

Match List I with List II.

Choose the correct answer from the options given below:

78.

The incorrect statement regarding the geometrical isomers of $ 2 $-butene is:

79.

Given below are two statements:
Statement (I): In partition chromatography, stationary phase is thin film of liquid present in the inert support.
Statement (II): In paper chromatography, the material of paper acts as stationary phase.
In the light of the above statements, choose the correct answer from the options given below:

80.

In Carius method $ 0.2425 \, \text{g} $ of an organic compound gave $ 0.5253 \, \text{g} $ silver chloride. The percentage of chlorine in the organic compound is :

81.

Kjeldahl’s method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from $ 0.55 \, \mathrm{g} $ of the compound neutralized $ 12.5 \, \mathrm{mL} $ of $ 1 \, \mathrm{M} \, \mathrm{H_2SO_4} $ solution. The percentage of nitrogen in the compound is __________. (Nearest integer)

82.

The IUPAC name of the following compound is:

83.

Match column I with column II.

Column I	Column II
I. $ \text{Mg}(\text{NH}_4)\text{PO}_4 $	$ \text{P}. $ Brown
II. $ \text{K}_3[\text{Co}(\text{NO}_2)_6] $	$ \text{Q}. $ White
III. $ \text{MnO}(\text{OH})_2 $	$ \text{R}. $ Yellow
IV. $ \text{Fe}_4[\text{Fe}(\text{CN})_6]_3 $	$ \text{S}. $ Blue

Choose the correct answer from the options given below:

84.

Given below are two statements I and II.
Statement I: Dumas method is used for estimation of “Nitrogen” in an organic compound.
Statement II: Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc $ \mathrm{H_2SO_4} $.
In the light of the above statements, choose the correct answer from the options give below:

85.

How many different stereoisomers are possible for the given molecule?

86.

The total number of $ \mathrm{C{-}C} $ sigma bond/s in mesityl oxide $( \mathrm{C_6H_{10}O} )$ is _______. (Round off to the Nearest Integer).

87.

Number of carbocations from the following that are not stabilized by hyperconjugation is ______.

88.

Which one of the following is the major product of the given reaction ?

89.

In the given compound, the number of $ 2^\circ $ carbon atom/s is ______.

90.

In Dumas’ method $ 292 \, \mathrm{mg} $ of an organic compound released $ 50 \, \mathrm{mL} $ of nitrogen gas $ (\mathrm{N_2}) $ at $ 300 \, \mathrm{K} $ temperature and $ 715 \, \mathrm{mm \, Hg} $ pressure. The percentage composition of '$ \mathrm{N} $' in the organic compound is ________% (Nearest integer)
(Aqueous tension at $ 300 \, \mathrm{K} $ $ = 15 \, \mathrm{mm \, Hg} $)

91.

The IUPAC name of ethylidene chloride is:

92.

Number of moles of methane required to produce $ 22 \, \mathrm{g} \; \mathrm{CO_2(g)} $ after combustion is $ x \times 10^{-2} $ moles. The value of $ x $ is ______.

93.

In Carius method of estimation of halogen, $ 0.25 \, \text{g} $ of an organic compound gave $ 0.15 \, \text{g} $ of silver bromide ($ \mathrm{AgBr} $). The percentage of Bromine in the organic compound is ________ $ \times 10^{-1}\% $ (Nearest integer).
(Given: Molar mass of Ag is $ 108 $ and Br is $ 80 \, \text{g mol}^{-1} $)

94.

The shape of carbocation is:

95.

According to IUPAC system, the compound is named as:

96.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Benzene is more stable than hypothetical cyclohexatriene
Reason R: The delocalized $ \pi $ electron cloud is attracted more strongly by nuclei of carbon atoms.
In the light of above statements, choose the most appropriate answer from the options given below:

97.

In $ 3,3 $-dimethylhex-$ 1 $-en-$ 4 $-yne, there are _________ $ sp^3 $, ________ $ sp^2 $ and __________ $ sp $ hybridised carbon atoms respectively.

98.

Identify correct statements from the following:
A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-$ 2 $-ene shows optical isomerism.
D. But-$ 1 $-ene and but-$ 2 $-ene are functional isomers.
E. Pentane and $ 2 $, $ 2 $-dimethyl propane are chain isomers.
Choose the correct answer from the options given below:

99.

A sample of $ 0.125 \, \text{g} $ of an organic compound when analyzed by Duma’s method yields $ 22.78 \, \text{mL} $ of nitrogen gas collected over KOH solution at $ 280 \, \text{K} $ and $ 759 \, \text{mm Hg} $. The percentage of nitrogen in the given organic compound is ________ . (Nearest integer)
Given: (a) The vapour pressure of water of $ 280 \, \text{K} $ is $ 14.2 \, \text{mm Hg} $.
(b) $ R = 0.082 \, \text{L atm K}^{-1} \text{ mol}^{-1} $

100.

Given below are two statements:
Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds.
Statement II: The sodium fusion extract of an organic compound having N and S gives Prussian blue colour with $ \mathrm{FeSO_4} $ and $ \mathrm{Na_4[Fe(CN)_6]} $.
In the light of the above statements, choose the correct answer from the options given below:

101.

The set of meta directing functional groups from the following sets is:

102.

Identify structure of $ 2,3 $-dibromo-$ 1 $-phenylpentane.

103.

The total number of ‘sigma’ and ‘pi’ bonds in $ 2 $-oxohex-$ 4 $-ynoic acid is ____________ .

104.

Choose the correct name for compound given below:

105.

Given below are two statements:
Statement I: $ (\text{CH}_3)_3 \overset{\oplus}{\text{C}}$ is more stable than $ \overset{\oplus}{\text{C}}H_3 $ as nine hyperconjugation interactions are possible in $ (\text{CH}_3)_3 \overset{\oplus}{\text{C}}$.
Statement II: $ \overset{\oplus}{\text{C}}H_3 $ is less stable than $ (\text{CH}_3)_3 \overset{\oplus}{\text{C}} $ as only three hyperconjugation interactions are possible in $ \overset{\oplus}{\text{C}}H_3$.
In the light of the above statements, choose the correct answer from the options given below:

106.

Identify correct statement/s:
(A) $ -\mathrm{OCH_3} $ and $ -\mathrm{NHCOCH_3} $ are activating group.
(B) $ -\mathrm{CN} $ and $ -\mathrm{OH} $ are meta directing group.
(C) $ -\mathrm{CN} $ and $ -\mathrm{SO_3H} $ are meta directing group.
(D) Activating groups act as ortho - and para directing groups.
(E) Halides are activating groups.
Choose the correct answer from the options given below :

107.

Match List I with List II

Choose the correct answer from the options given below:

108.

Which of the following is most stable?

109.

Chromatographic technique/s based on the principle of differential adsorption is/are:
A. Column chromatography
B. Thin layer chromatography
C. Paper chromatography
Choose the most appropriate answer from the options given below:

110.

The IUPAC name of the following compound is :

111.

Number of optical isomers for $ 2 $-chlorobutane ______.

112.

Which technique among the following, is most appropriate in separation of a mixture of $ 100 \, \text{mg} $ of p-nitrophenol and picric acid?

113.

The isomeric deuterated bromide with molecular formula $ \mathrm{C_4H_8DBr} $ having $ 2 $ chiral carbon atoms is:

114.

Match List I with List II:

Choose the correct answer from the options given below:

115.

Which of the following is the correct IUPAC name of given organic compound ($ X $)?

116.

The correct stability order of carbocations is:

117.

In Kjeldahl's method for estimation of nitrogen, $ \mathrm{CuSO_4} $ acts as:

118.

IUPAC name of following compound is:

119.

In Dumas method for estimation of nitrogen, $ 0.50 \, \text{g} $ of an organic compound gave $ 70 \, \text{mL} $ of nitrogen collected at $ 300 \, \text{K} $ and $ 715 \, \text{mm} $ pressure. The percentage of nitrogen in the organic compound is ______ $ \% $. (Aqueous tension at $ 300 \, \text{K} $ is $ 15 \, \text{mm} $.)

120.

The hydrocarbon ($ X $) with molar mass $ 80 \, \text{g mol}^{-1} $ and $ 90\% $ carbon has ________ degree of unsaturation.

121.

The correct arrangement for decreasing order of electrophilic substitution for above compounds is:

122.

While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from $ 0.25 \, \text{g} $ of the compound neutralized $ 2.5 \, \text{mL} $ of $ 2 \, \text{M} \, \mathrm{H_2SO_4} $. The percentage of nitrogen present in organic compound is ______.

123.

On complete combustion $ 0.30 \, \text{g} $ of an organic compound gave $ 0.20 \, \text{g} $ of carbon dioxide and $ 0.10 \, \text{g} $ of water. The percentage of carbon in the given organic compound is ____________ (Nearest integer)

124.

Which one of the following compounds does not exhibit resonance?

125.

Arrange the following carbocations in decreasing order of stability.

126.

Staggered and eclipsed conformers of ethane are :

127.

Given below are two statement:
Statements I : Bromination of phenol in solvent with low polarity such as $ \mathrm{CHCl_3} $ or $ \mathrm{CS_2} $ requires Lewis acid catalyst.
Statement II : The Lewis acid catalyst polarizes the bromine to generate $ \mathrm{Br^+} $.
In the light of the above statements, choose the correct answer from the options given below:

128.

Which one of the following compounds is non-aromatic?

129.

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below:

130.

Sodium fusion extract of an organic compound $ (\mathrm{Y}) $ with $ \mathrm{CHCl_{3}} $ and chlorine water gives violet color to the $ \mathrm{CHCl_{3}} $ layer. $ 0.15 \,\mathrm{g} $ of $ (\mathrm{Y}) $ gave $ 0.12 \,\mathrm{g} $ of the silver halide precipitate in Carius method. Percentage of halogen in the compound $ (\mathrm{Y}) $ is __________. (Nearest integer)
(Given: molar mass $ \mathrm{g\,mol^{-1}} $ $ \mathrm{C} : 12 $, $ \mathrm{H} : 1 $, $ \mathrm{Cl} : 35.5 $, $ \mathrm{Br} : 80 $, $ \mathrm{I} : 127 $ )

131.

The number of moles of $ \mathrm{CuO} $, that will be utilized in Dumas method for estimating nitrogen in a sample of $ 57.5 \,\text{g} $ of $ \mathrm{N,N} $-dimethylaminopentane is __________ $ \times 10^{-2} $. (Nearest integer)

132.

Functional group present in sulphonic acids is:

133.

The number of different chain isomers for $ \mathrm{C}_7\mathrm{H}_{16} $ is $ \_\_\_\_\_\_ $.

134.

Match List - I with List – II

List – I (Separation of)		List – II (Separation Technique)
(A) Aniline from aniline-water mixture		(I) Simple distillation
(B) Glycerol from spent-lye in soap industry		(II) Fractional distillation
(C) Different fractions of crude oil in petroleum industry		(III) Distillation at reduced pressure
(D) Chloroform-Aniline mixture		(IV) Steam distillation

Choose the correct answer from the options given below:

135.

Lassaigne’s test is used for detection of:

136.

Correct order of stability of carbocation is:

137.

In Carius method of estimation of halogen, $0.45\,\text{g}$ of an organic compound gave $0.36\,\text{g}$ of $\mathrm{AgBr}$. Find out the percentage of bromine in the compound.
[Molar masses: $\mathrm{AgBr}=188\,\mathrm{g\,mol^{-1}}$; $\mathrm{Br}=80\,\mathrm{g\,mol^{-1}}$]

138.

The sum of sigma $ (\sigma) $ and pi $ (\pi) $ bonds in Hex-$ 1,3 $-dien-$ 5 $-yne is ________.

139.

The most stable carbocation from the following is :

140.

Number of geometrical isomers possible for the given structure is/are _______.

141.

Given below are two statements:
Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.
Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.
In the light of the above statements, choose the correct answer from the options given below:

142.

In IUPAC nomenclature, the correct of decreasing priority of functional group is:

143.

Given below are two statements.
Statement I: The dipole moment of is greater than
Statement II: $ \mathrm{C_1-C_2} $ bond length of is greater than $ \mathrm{C_1-C_2} $ bond length of
In the light of the above statements, choose the correct answer from the options given below:

144.

On a thin layer chromatographic place, an organic compound moved by $ 3.5 \, \text{cm} $, while the solvent moved by $ 5 \, \text{cm} $. The retardation factor of the organic compound is __________ $ \times 10^{-1} $.

145.

When $ 0.15 \, \text{g} $ of an organic compound was analyzed using Carius method for estimation of bromine, $ 0.2397 \, \text{g} $ of $ \text{AgBr} $ was obtained. The percentage of bromine in the organic compound is ________ . (Nearest integer) [Atomic mass : Silver $ = 108 $, Bromine $ = 80 $]

146.

Bond line formula of $ \mathrm{HOCH(CN)_2} $ is:

147.

Correct statements for the given reaction are:

A. Compound 'B' is aromatic
B. The completion of above reaction is very slow
C. 'A' shows tautomerism
D. The bond lengths of C−C in compound B are found to be same
Choose the correct answer from the options given below:

148.

Given below are $ 2 $ statements:
Statement (I): Kjeldahl method is applicable to estimate nitrogen in pyridine.
Statement (II): The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method.
In the light of the above statements, choose the correct answer from the options given below:

149.

The possible number of stereoisomers for $ 5 $-phenylpent-$ 4 $-en-$ 2 $-ol is ________.

150.

$ 0.25 \, \text{g} $ of an organic compound containing chlorine gave $ 0.40 \, \text{g} $ of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given: Molar mass of $ \text{Ag} $ is $ 108 \, \text{g mol}^{-1} $ and that of $ \text{Cl} $ is $ 35.5 \, \text{g mol}^{-1} $ )

151.

$ 0.2 \, \text{g} $ of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $ \text{N}_2 $ evolved (at STP) was found to be $ 22.400 \, \text{mL} $. The percentage of nitrogen in the compound is __________. [nearest integer]
(Given: Molar mass of $ \text{N}_2 $ is $ 28 \, \text{g mol}^{-1} $, Molar volume of $ \text{N}_2 $ at STP : $ 22.4 \, \text{L} $)

152.

The transformation occurring in the Duma's method is given below
$ \mathrm{C_2H_7N} + \left( 2x + \frac{y}{2} \right)\mathrm{CuO} \rightarrow x\mathrm{CO_2} + \frac{y}{2}\mathrm{H_2O} + \frac{z}{2}\mathrm{N_2} + \left( 2x + \frac{y}{2} \right)\mathrm{Cu} $
The value of $ y $ is _________ . (Integer answer)

153.

Among the given organic compounds, the total number of aromatic compounds is ________.

154.

In the given structure, number of $ sp $ and $ sp^2 $ hybridized carbon atoms present respectively are:

155.

The incorrect statement regarding conformations of ethane is:

156.

In Carius method for estimation of halogens, $ 180 \,\text{mg} $ of an organic compound product $ 143.5 \,\text{mg} $ of $ \mathrm{AgCl} $. The percentage composition of chlorine in the compound is ___________ $ \% $.
(Given: molar mass in $ \mathrm{g \, mol^{-1}} $ of Ag: $ 108 $, Cl: $ 35.5 $)

157.

The incorrect statements regarding geometrical isomerism are:
(A) Propene shows geometrical isomerism
(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond
(C) $ \text{Cis-but-2-ene} $ has higher dipole moment than $ \text{trans-but-2-ene} $
(D) $ \text{2-methylbut-2-ene} $ shows two geometrical isomers
(E) Trans-isomer has lower melting point than cis isomer
Choose the correct answer from the options given below:

158.

How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects ?

159.

Compound with molecular formula $ \mathrm{C_3H_6O} $ can show:

160.

The alkane from below having two secondary hydrogens is:

161.

Cyclohexene is ____________ type of an organic compound.

162.

Which of the following carbocations is most stable?

163.

Which of the following molecule/species is most stable?

164.

Match List-I with List-II.

Choose the correct answer from the options given below:

165.

Thin layer chromatography of a mixture shows the following observation:

The correct order of elution in the silica gel column chromatography is:

166.

Increasing order of stability of the resonance structures is :
I.
II.
III.
IV.

Choose the correct answer from the options given below:

167.

Given below are two statements:
Statement-I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement-II: The vapours rising up in the fractionating column become richer in high boiling component of the mixture.
In the light of the above statements, choose the correct answer from the options given below:

168.

Consider the following sequence of reactions to produce major product (A).

Molar mass of product (A) is ________ $ \text{g mol}^{-1} $.
(Given molar mass in $ \text{g mol}^{-1} $ of C : $ 12 $, H : $ 1 $, O : $ 16 $, Br : $ 80 $, N : $ 14 $, P : $ 31 $)

169.

Given below are two statements:
Statement I: The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.
Statement II: The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.
In the light of the above statements, choose the most appropriate answer from the options given below.

170.

Ionic reactions with organic compounds proceed through:
(A) homolytic bond cleavage (B) heterolytic bond cleavage (C) free radical formation (D) primary free radical (E) secondary free radical
Choose the correct answer from the options given below:

171.

Following Kjeldahl’s method, $ 1 \, \text{g} $ of organic compound released ammonia, that neutralised $ 10 \, \text{mL} $ of $ 2 \, \text{M}\ \, \text{H}_2\text{SO}_4 $. The percentage of nitrogen in the compound is __________ $ \% $.

172.

The compound with molecular formula $ \mathrm{C_6H_6} $, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has _____________ $ \pi $ electrons.

173.

The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are $ 3.25 \, \text{cm} $, $ 2.08 \, \text{cm} $ and $ 1.05 \, \text{cm} $, respectively. The ratio of $ R_f $ values of A to B is ________.

174.

Given below are two statements:
Statement I: $ 2,6 $-diethylcyclohexanone and $ 6 $-methyl-$ 2 $-n-propylcyclohexanone are metamers
Statement II: $ 2,2,6,6 $-tetramethylcyclohexanone exhibits keto-enol tautomerism.
In the light of the above statements, choose the correct answer from the options given below:

175.

Mixture of $ 1 \,\text{g} $ each of chlorobenzene, aniline and benzonic acid is dissolved in $ 50 \,\text{mL} $ ethyl acetate and placed in a separating funnel, $ 5\,\text{M} $ NaOH $ (30 \,\text{mL}) $ was added in the same funnel. The funnel was shaken vigorously and then kept aside. The ethyl acetate layer in the funnel contains:

176.

Given below are two statements:
Statement I: IUPAC name of $ \mathrm{HO-CH_2-(CH_2)_5-CH_2-COCH_3} $ is $ 7 $-hydroxyheptan-$ 2 $-one.
Statement II: $ 2 $-oxoheptan-$ 7 $-ol is the correct IUPAC name for above compound.
In the light of the above statements, choose the most appropriate answer from the options given below:

177.

Match List - I with List - II.

Choose the correct answer from the options given below:

178.

Structure of $ 4 $-Methylpent-$ 2 $-enal is:

179.

Given below are two statements :
Statement I : Tropolone is an aromatic compound and has $ 8\pi $ electrons.
Statement II : $ \pi $ electrons of $ >\!C=O $ group in tropolone is involved in aromaticity.
In the light of the above statements, choose the correct answer from the options given below :

180.

Arrange the following carbanions in the decreasing order of stability.

Choose the correct answer from the options given below:

181.

What is the correct IUPAC name of

182.

Match List-I with List-II:

List-I (Pair of Compounds)	List-II (Isomerism)
(A) n-propanol and Isopropanol	(I) Metamerism
(B) Methoxypropane and ethoxyethane	(II) Chain Isomerism
(C) Propanone and Propanal	(III) Position Isomerism
(D) Neopentane and Isopentane	(IV) Functional Isomerism

Choose the correct answer from the options given below:

183.

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $ \mathrm{FeSO_4} $ in presence of concentrated $ \mathrm{H_2SO_4} $ indicates the presence of element/s

184.

A species having carbon with sextet of electrons and can act as electrophile is called:

185.

The correct order of stability of given carbocations is :

186.

Which of the following statement is correct for paper chromatography?

187.

Choose the correct statement regarding the formation of carbocations A and B given.

188.

The steam volatile compounds among the following are:

Choose the correct answer from the options given below:

189.

IUPAC name of following hydrocarbon $ (X) $ is:

190.

In Carius method, $ 0.75 \, \mathrm{g} $ of an organic compound gave $ 1.2 \, \mathrm{g} $ of barium sulphate, find percentage of sulphur (molar mass $ 32 \, \mathrm{g\,mol^{-1}} $). Molar mass of barium sulphate is $ 233 \, \mathrm{g\,mol^{-1}} $.

191.

Given below are two statements:
Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is $ \mathrm{CH_3^-} > \mathrm{CH_3{-}CH_2^-} > (\mathrm{CH_3})_2\mathrm{CH^-} > (\mathrm{CH_3})_3\mathrm{C^-} $.
Statement II: Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect.
In the light of the above statements, choose the correct answer from the options given below

192.

Given below are two statements:
Statement I: Hyperconjugation is a permanent effect.
Statement II: Hyperconjugation in ethyl cation $ \displaystyle (\text{CH}_3 - \overset{+}{\text{C}}\text{H}_2) $ involves the overlapping of $ \mathrm{C_{sp^2}-H_{1s}} $ bond with empty $ 2p $ orbital of other carbon.
Choose the correct option:

193.

The total number of aromatic compounds/species from the following is:

194.

The Lassaigne's extract is boiled with dil $ \mathrm{HNO_3} $ before testing for halogens because,

195.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A simple distillation can be used to separate a mixture of propanol and propanone.
Reason (R): Two liquids with a difference of more than $ 20^\circ \mathrm{C} $ in their boiling points can be separated by simple distillations.
In the light of the above statements, choose the most appropriate answer from the options given below:

← PreviousQuestion 131 of 195Next →

JEE Main 2021 27th August Morning Shift

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ