JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

What is the correct IUPAC name of ?

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

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

The correct order of stability of following carbocations is:

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

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 __________\( \% \).

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:

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). \( \) \( \) \( (\text{Aqueous tension at } 300 \,\text{K} = 15 \,\text{mm Hg}) \)

Total number of nucleophiles from the following is:

10.

The IUPAC name of the following compound is:

11.

\( \mathrm{CrCl_3.xNH_3} \) 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 \( K_f = 1.86 \, \text{K kg mol}^{-1} \) )

12.

Match List - \( \text{I} \) with List - \( \text{II} \).

Choose the correct answer from the options given below:

13.

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\(^{-1}\))

14.

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:

15.

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:

16.

How many different stereoisomers are possible for the given molecule?

17.

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 \( 300 \, \mathrm{K} \) \( = 15 \, \mathrm{mm \, Hg} \))

18.

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 \( 80 \, \text{g mol}^{-1} \))

19.

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

20.

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:

21.

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 :

22.

The IUPAC name of the following compound is :

23.

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

24.

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

25.

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below:

26.

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:

27.

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

28.

The most stable carbocation from the following is :

29.

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:

30.

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:

31.

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

32.

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

33.

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: \( 35.5 \))

34.

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:

35.

The alkane from below having two secondary hydrogens is:

36.

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 : \( 31 \))

37.

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.

38.

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:

39.

Match List - I with List - II.

Choose the correct answer from the options given below:

40.

What is the correct IUPAC name of

41.

The steam volatile compounds among the following are:

Choose the correct answer from the options given below:

← PreviousQuestion 13 of 41Next →

JEE Main 2025 29th Jan Evening Shift

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ