JEE Mains JEE Advance BITSAT
JEE Mains | PYQ

Year

All years 2026 2025 2024 2023 2022 2021

Identify the incorrect statement from the following:

When sugar \( X \) is boiled with dilute \( \mathrm{H_2SO_4} \) in alcoholic solution, two isomers \( A \) and \( B \) are formed. \( A \) on oxidation with \( \mathrm{HNO_3} \) yields saccharic acid where as \( B \) is laevorotatory. The compound \( X \) is:

The correct representation in six membered pyranose form for the following sugar \([X]\) is

Sugar \([X]\):

The conversion of hydroxyapatite occurs due to presence of \( \mathrm{F^-} \) ions in water. The correct formula of hydroxyapatite is:

The incorrect statement regarding the given structure is:

A short peptide on complete hydrolysis produces \( 3 \) moles of glycine \( (\mathrm{G}) \), two moles of leucine \( (\mathrm{L}) \) and two moles of valine \( (\mathrm{V}) \) per mole of peptide. The number of peptide linkages in it are ______.

From the given following (A to D) cyclic structures, those which will not react with Tollen’s reagent are:

Given below are two statements.
Statement I : Maltose has two \( \alpha \)- D-glucose units linked at \( C_1 \) and \( C_4 \) and is a reducing sugar.
Statement II: Maltose has two monosaccharides; \( \alpha \)- D-glucose and \( \beta \)- D-glucose linked at \( C_1 \) and \( C_6 \) and it is a non-reducing sugar.
In the light of the above statements, choose the correct answer from the options given below.

From the vitamins \( A, B_1, B_6, B_{12}, C, D, E \) and \( K \), the number of vitamins that can be stored in our body is _________.

10.

Which one of the following is a reducing sugar?

11.

A protein ‘X’ with molecular weight of \( 70{,}000 \, \mathrm{u} \), on hydrolysis gives amino acids. One of these amino acid is:

12.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar.
Reason (R) : Sucrose involves glycosidic linkage between \( C_{1} \) of \( \beta \)-glucose and \( C_{2} \) of \( \alpha \)- fructose.
Choose the most appropriate answer from the options given below:

13.

Which is not true for arginine?

14.

Match List-I with List-II.

Choose the correct answer from the options given below :

15.

Match the List-I with List-II

List-I Name of amino acid	List-II One letter symbol/type
A. Arginine	I. D/Non-essential
B. Aspartic acid	II. R/Essential
C. Lysine	III. E/Non-essential
D. Glutamic acid	IV. K/Essential

Choose the correct answer from the options given below:

16.

DNA molecule contains \( 4 \) bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

17.

Given below are two statements:
Statement I : D-glucose pentaacetate reacts with \( 2,4 \)-dinitrophenylhydrazine.
Statement II : Starch, on heating with concentrated sulfuric acid at \( 100^\circ \mathrm{C} \) and \( 2\text{–}3 \) atmosphere pressure produces glucose.
In the light of the above statements, choose the correct answer from the options given below:

18.

Which of the following acids is a vitamin?

19.

Identify correct conversion during acidic hydrolysis from the following:
(A) starch gives galactose.
(B) cane sugar gives equal amount of glucose and fructose.
(C) milk sugar gives glucose and galactose.
(D) amylopectin gives glucose and fructose
(E) amylose gives only glucose.
Choose the correct answer from the options given below:

20.

Following tetrapeptide can be represented as:

(F, L D, Y, I, Q, P are one letter codes for amino acids)

21.

Given below are two statements:

Statement I: The structure of Maltose is given below:

Statement II: The structure of Lactose is given below:

In the light of the above statements, choose the correct answer from the options given below:

22.

Number of compounds from the following which will not produce orange red precipitate with Benedict solution is ________.
Glucose, maltose, sucrose, ribose, \( 2 \)-deoxyribose, amylose, lactose

23.

Sulphur \( (\mathrm{S}) \) containing amino acids from the following are:
(a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid

24.

A tetrapeptide, "x" on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is:

25.

All structures given below are of vitamin C. Most stable of them is:

26.

Match items of Row I with those of Row II.
Row I:

Row II :
(i) \(\alpha\) − D − (−) − Fructofuranose, (ii) β − D − (−) − Fructofuranose,
(iii) \(\alpha\) − D − (−) Glucopyranose, (iv) β − D − (−) − Glucopyranose
Correct match is:

27.

Match List-I with List-II

List-I	List-II
(A) Glucose + \( \mathrm{HI} \)	(I) Gluconic acid
(B) Glucose + \( \mathrm{Br}_2 \) water	(II) Glucose pentaacetate
(C) Glucose + acetic anhydride	(III) Saccharic acid
(D) Glucose + \( \mathrm{HNO}_3 \)	(IV) Hexane

Choose the correct answer from the options given below:

28.

A peptide synthesized by the reaction of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have____ peptide linkages.

29.

The correct structure of Rhumann’s Purple, the compound formed in the reaction of ninhydrin with proteins is:

30.

The structure of protein that is unaffected by heating is:

31.

Which structure of protein remains intact after coagulation of egg white on boiling?

32.

Animal starch is the other name of

33.

How many of the given compounds will give a positive Biuret test ___________?
Glycine, Glycylalanine, Tripeptide, Biuret

34.

Match List-I with List-II.

Choose the correct answer from the options given below:

35.

During the denaturation of proteins, which of these structure will remain intact?

36.

Stability of \( \alpha \)-helix structure of proteins depends upon:

37.

The secondary structure of protein is stabilized by:

38.

Match List I with List II.

Choose the correct answer from the options given below:

39.

The one that does not stabilize \( 2^\circ \) and \( 3^\circ \) structures of proteins is:

40.

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is ________.
\( 5^{\prime} - \mathrm{G-G-C-A-A-A-T-C-G-G-C-T-A} - 3^{\prime} \)

41.

The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is __________.

42.

Which of the following is the correct structure of L-Glucose?

43.

Which of the following is the correct structure of L-Fructose?

44.

Match List-I with List-II:

Choose the most appropriate answer from the options given below:

45.

Match List I and List II

Choose the correct answer from the options given below:

46.

L-isomer of tetrose \( X(\mathrm{C_4H_8O_4}) \) gives positive Schiff’s test and has two chiral carbons. On acetylation, ‘X’ yields triacetate. ‘X’ also undergoes following reactions
\(\text{'A'} \xleftarrow{\text{HNO}_3} \text{'X'} \xrightarrow{\text{NaBH}_4} \text{'B' (Chiral compound)}\)
‘X’ is:

47.

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below:

48.

Two nucleotides are joined together by a linkage known as :

49.

In Carius tube, an organic compound ‘\( X \)’ is treated with sodium peroxide to form a mineral acid ‘\( Y \)’. The solution of \( \mathrm{BaCl_2} \) is added to ‘\( Y \)’ to form a precipitate ‘\( Z \)’. ‘\( Z \)’ is used for the quantitative estimation of an extra element. ‘\( X \)’ could be:

50.

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

51.

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is:

52.

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.

53.

Out of following isomeric forms of uracil, which one is present in RNA?

54.

Match List I with List II.

LIST I (Bio polymer)	LIST II (Monomer)
A. Starch	I. nucleotide
B. Cellulose	II. \( \alpha \)-glucose
C. Nucleic acid	III. \( \beta \)-glucose
D. Protein	IV. \( \alpha \)-amino acid

Choose the correct answer from the options given below:

55.

Sugar moiety in DNA and RNA molecules respectively are:

56.

Match List I with List II

List I	List II
(A) α - Glucose and α - Galactose	(I) Functional isomers
(B) α - Glucose and β - Glucose	(II) Homologous
(C) α - Glucose and α - Fructose	(III) Anomers
(D) α - Glucose and α - Ribose	(IV) Epimers

Choose the correct answer from the options given below:

57.

The water soluble protein is:

58.

Match List I with List II

LIST I (Vitamin)	LIST II (Deficiency disease)
A. Vitamin A	I. Beri-Beri
B. Thiamine	II. Cheilosis
C. Ascorbic acid	III. Xerophthalmia
D. Riboflavin	IV. Scurvy

Choose the correct answer from the options given below:

59.

Which one of the following methods is most suitable for preparing deionized water?

60.

Match List I with List II

Choose the correct answer from the options given below:

61.

The number of tripeptides formed by three different amino acids using each amino acid once is ______________.

62.

The total number of negative charge in the tetrapeptide, Gly–Glu–Asp–Tyr, at \( \mathrm{pH} \) \( 12.5 \) will be ________. (Integer answer)

63.

Reaction of Grignard reagent, \( \mathrm{C_2H_5MgBr} \) with \( \mathrm{C_8H_8O} \) followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, \( \mathrm{C_{10}H_{13}Cl} \). The compound B is:

64.

Uracil is a base present in RNA with the following structure. \( \% \) of \( \mathrm{N} \) in uracil is \( \_\_\_\_\_ \).

Given:
Molar mass \( \mathrm{N} = 14 \, \mathrm{g\,mol^{-1}} \)
\( \mathrm{O} = 16 \, \mathrm{g\,mol^{-1}} \)
\( \mathrm{C} = 12 \, \mathrm{g\,mol^{-1}} \)
\( \mathrm{H} = 1 \, \mathrm{g\,mol^{-1}} \)

65.

Which of the following is NOT an example of fibrous protein?

66.

Which one of the following is a water soluble vitamin, that is not excreted easily?

67.

Match List - I with List - II.

Choose the correct answer from the options given below:

68.

Identify the essential amino acids from below:
(A) Valine (B) Proline (C) Lysine (D) Threonine (E) Tyrosine
Choose the correct answer from the options given below:

69.

Total number of tripeptides possible by mixing of valine and proline is ________ .

70.

The correct statements are:
A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
C. Nucleotides are joined together by glycosidic linkage between \( \mathrm{C_1} \) and \( \mathrm{C_4} \) carbons of the pentose sugar.
D. Quaternary structure of proteins represents overall folding of the polypeptide chain.
Choose the correct answer from the options given below:

71.

Which of the following polymer is used in the manufacture of wood laminates?

72.

Thiamine and pyridoxine are also known respectively as:

73.

Match List-I with List-II.

Choose the most appropriate answer from the options given below:

74.

How many of the following drugs is/are example(s) of broad spectrum antibiotics?
Ofloxacin, Penicillin G, Terpineol, Salvarsan.

75.

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Amylose is insoluble in water.
Reason R : Amylose is a long linear molecule with more than \( 200 \) glucose units.
In the light of the above statements, choose the correct answer from the options given below.

76.

Total number of essential amino acid among the given list of amino acids is _____.
Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

77.

For the below given cyclic hemiacetal (\( X \)), the correct pyranose structure is:

78.

Given below are two statements:
Statement (I): On hydrolysis, oligo peptides given rise to fewer number of \( \alpha \) – amino acids while proteins given rise to a large number of \( \beta \) – amino acids
Statement (II): Natural protein are denatured by acids which convert the water soluble form of fibrous proteins to their waver insoluble form.
In the light of the above statements, choose the most appropriate answer from the options given below:

79.

Match List I with List II:

List I	List II
Natural Amino Acid	One Letter Code
(A) Arginine	(I) D
(B) Aspartic acid	(II) N
(C) Asparagine	(III) A
(D) Alanine	(IV) R

Choose the correct answer from the options given below:

80.

A protein ‘A’ contains \( 0.30\% \) of glycine (molecular weight \( 75 \)). The minimum molar mass of the protein ‘A’ is __________ \( \times 10^3 \, \mathrm{g\, mol^{-1}} \) [nearest integer]

81.

Identify the correct statements.
A. Glucose exists in two anomeric forms.
B. Anomers of glucose differ in configuration at \( \mathrm{C\!-\!1} \) in cyclic hemiacetal structure.
C. Melting point of \( \alpha \)-anomer of glucose is greater than \( \beta \)-anomer.
D. Specific rotation of \( \alpha \)-anomer is \( +19^\circ \) while for \( \beta \)-anomer is \( +112^\circ \).
E. \( \alpha \) and \( \beta \)-anomers of glucose are prepared by crystallization of saturated glucose solution at \( 303 \, \mathrm{K} \) and \( 371 \, \mathrm{K} \) respectively.
Choose the correct answer from the options given below:

82.

In the given pentapeptide, find out an essential amino acid \((Y)\) and the sequence present in the pentapeptide:

Choose the correct answer from the options given below:

83.

The compound ‘A’ is a complementary base of ________ in DNA strands.

84.

Given below are two statements:
Statement I: Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes.
Statement II: Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes.
In the light of the above statements, choose the correct answer from the options given below:

85.

Given below are two statements : one is labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A) : Ketoses gives Seliwanoff’s test faster than Alsoses.
Reason (R) : Ketoses undergoes \( \beta \) - elimination followed by formation of furfural.
In the light of the above statements, choose the correct from the options given below:

86.

Number of cyclic tripeptides formed with \( 2 \) amino acids \( A \) and \( B \) is:

87.

In an oligopeptide named Alanyl Glycyl Phenyl Alanyl Isoleucine, the number of \( \mathrm{sp^2} \) hybridized carbons is _____.

88.

Given below are two statements:
Statement I: D-(+)‑glucose + D-(+) fructose \( \xrightarrow{-\mathrm{H_2O}} \) Sucrosesucrose \( \xrightarrow{\text{hydrolysis}} \) D-(+) glucose + D-(+) fructose
Statement II: Invert sugar is formed during sucrose hydrolysis
In the light of the above statements, choose the correct answer from the options given below.

89.

The \( \alpha \) – Helix and \( \beta \) – Pleated sheet structures of protein are associated with its:

90.

Which one of the following compounds contains \( \beta - \mathrm{C}_1 - \mathrm{C}_4 \) glycosidic linkage?

91.

The carbohydrate “Ribose” present in DNA, is:
(A) A pentose sugar (B) present in pyranose from
(C) in “D” configuration (D) a reducing sugar, when free
(E) in \( \alpha \) – anomeric form
Choose the correct answer from the options given below:

92.

Which of the following compounds is an example of hypnotic drug?

93.

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

94.

Hydrolysis of sucrose gives :

95.

The incorrect statement from the following with respect to carbohydrates is:

96.

Number of compounds among the following which contain sulphur as heteroatom is _________.
Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine.

97.

Match List I with List II.

List I	List II
Natural amino acid	One letter code
A Glutamic aid	I Q
B Glutamine	II W
C Tyrosine	III E
D Tryptophan	IV Y

Choose the correct answer from the options given below:

98.

The incorrect statement about Glucose is:

99.

Identify the correct statements.
A. Arginine and Tryptophan are essential amino acids.
B. Histidine does not contain heterocyclic ring in its structure.
C. Proline is a six membered cyclic ring amino acid.
D. Glycine does not have chiral centre.
E. Cysteine has characteristic feature of side chain as MeS – \( \mathrm{CH_2} \) – \( \mathrm{CH_2} \) –.
Choose the correct answer from the options given below:

100.

Match the LIST-I with LIST-II.

Choose the correct answer from the options given below:

101.

A non-reducing sugar “A” hydrolyses to give \( two \) reducing mono saccharides. Sugar A is:

102.

Match List-I with List-II.

List-I Vitamin	List-II Name
A. Vitamin B1	I. Pyridoxine
B. Vitamin B2	II. Ascorbic acid
C. Vitamin B6	III. Thiamine
D. Vitamin C	IV. Riboflavin

Choose the correct answer from the options given below:

103.

. Match List-I with List-II

List -I (Polymer)	List-II (Monomer)
(A) Neoprene	(I) Acrylonitrile
(B) Teflon	(II) Chloroprene
(C) Acrilan	(III) Tetrafluoroethene
(D) Natural rubber	(IV) Isoprene

Choose the correct answer from the options given below:

104.

Which one among the following chemical test is used to distinguish monosaccharide from disaccharide?

105.

If one strand of a DNA has the sequence \( \text{ATGCTTCA} \), sequence of the bases in complementary stand is:

106.

Coagulation of egg, on heating is because of:

107.

Match List I with List II:

Choose the correct answer from the options given below:

108.

In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) – (Number of peptide bonds) is __________.

109.

Choose the correct option for structures of A and B, respectively:

110.

Which of the following is correct structure of tyrosine?

111.

A sugar ‘\( X \)’ dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ‘\( X \)’ is:

112.

Type of amino acids obtained by hydrolysis of proteins is:

113.

A chemical which stimulates the secretion of pepsin is:

114.

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

115.

The total number of carbon atoms present in tyrosine, an amino acid, is _______________.

116.

The total number of correct statements, regarding the nucleic acids is _______.
A. RNA is regarded as the reserve of genetic information.
B. DNA molecule self-duplicates during cell division.
C. DNA synthesizes proteins in the cell
D. The message for the syntheses of particular proteins is present in DNA
E. Identical DNA strands are transferred to daughter cells.

117.

Which one of the following is correct structure for cytosine?

118.

Sugar which does not given reddish brown precipitate with Fehling’s reagent, is:

119.

\( \displaystyle \underset{\text{Sucrose}}{\text{C}_{12}\text{H}_{22}\text{O}_{11}} + \text{H}_2\text{O} \xrightarrow{\text{Enzyme A}} \underset{\text{Glucose}}{\text{C}_6\text{H}_{12}\text{O}_6} + \underset{\text{Fructose}}{\text{C}_6\text{H}_{12}\text{O}_6}\)
\( \displaystyle \underset{\text{Glucose}}{\text{C}_6\text{H}_{12}\text{O}_6} \xrightarrow{\text{Enzyme B}} 2\text{C}_2\text{H}_5\text{OH} + 2\text{CO}_2 \)
In the above reactions, the enzyme A and enzyme B respectively are :

120.

Fat soluble vitamins are:
(A) Vitamin B \( 1 \)
(B) Vitamin C
(C) Vitamin E
(D) Vitamin B \( 12 \)
(E) Vitamin K
Choose the correct answer from the options given below:

121.

The formulas of A and B are the following reaction sequence.

122.

Which one of the following tests used for the identification of functional group in organic compounds does not use copper reagent ?

123.

The incorrect statements regarding enzymes are:
(A) Enzymes are biocatalysts
(B) Enzymes are non-specific and can catalyse different kinds of reactions
(C) Most Enzymes are globular proteins
(D) Enzyme-oxidase catalyses the hydrolysis of maltose into glucose.
Choose the correct answer from the option given below:

124.

Compound A gives D–Galactose and D–Glucose on hydrolysis. The compound A is:

125.

Given below are two statements:

Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.

Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.

In the light of the above statements, choose the correct answer from the options given below:

126.

Identify the correct statement among the following:

127.

Match the LIST-I with LIST-II.

List-I Deficiency Disease	List-II Vitamin
A. Scurvy	I. Pyridoxine
B Convulsions	II. Vitamin A
C Cheilosis	III. Ascorbic Acid
D Xerophthalmia	IV. Riboflavin

Choose the correct answer from the options given below:

128.

Deficiency of vitamin \( K \) causes:

129.

Which of the following gives a positive test with ninhydrin?

← PreviousQuestion 89 of 129Next →

JEE Main 2025 23rd Jan Evening Shift

The \( \alpha \) – Helix and \( \beta \) – Pleated sheet structures of protein are associated with its:

JEE MainsJEE AdvanceBITSATJEE Mains | PYQ

JEE Mains JEE Advance BITSAT
JEE Mains | PYQ