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-CH2-CH2-. Choose the correct answer from the options given below:

A. Arginine and Tryptophan are indeed essential amino acids (cannot be synthesized by the human body). (Correct) B. Histidine contains an imidazole ring, which is a heterocyclic ring. So statement B is incorrect. C. Proline contains a pyrrolidine ring, which is a five-membered cyclic ring. So statement C is incorrect. D. Glycine is NH2-CH2-COOH. Because its alpha carbon has two identical hydrogen atoms attached, it lacks a chiral center. (Correct) E. Cysteine's side chain is a thiol group (-CH2-SH), not a thioether (MeS-CH2-CH2- which belongs to Methionine). So statement E is incorrect. Correct statements: A and D. Class 12 Chemistry: Biomolecules

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-CH2-CH2-. Choose the correct answer from the options given below:

A. Arginine and Tryptophan are indeed essential amino acids (cannot be synthesized by the human body). (Correct) B. Histidine contains an imidazole ring, which is a heterocyclic ring. So statement B is incorrect. C. Proline contains a pyrrolidine ring, which is a five-membered cyclic ring. So statement C is incorrect. D. Glycine is NH2-CH2-COOH. Because its alpha carbon has two identical hydrogen atoms attached, it lacks a chiral center. (Correct) E. Cysteine's side chain is a thiol group (-CH2-SH), not a thioether (MeS-CH2-CH2- which belongs to Methionine). So statement E is incorrect. Correct statements: A and D. Class 12 Chemistry: Biomolecules

Identify the correct statements. A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain…

Year	2026	2025	2024	Total
Questions	9	19	8	36

Year

2026

2025

2024

Total

Questions

Solution & Explanation

Core Logic

A. Arginine and Tryptophan are indeed essential amino acids (cannot be synthesized by the human body). (Correct)

B. Histidine contains an imidazole ring, which is a heterocyclic ring. So statement B is incorrect.

C. Proline contains a pyrrolidine ring, which is a five-membered cyclic ring. So statement C is incorrect.

D. Glycine is $NH₂-CH₂-COOH$ $\mathrm{NH_2-CH_2-COOH}$. Because its alpha carbon has two identical hydrogen atoms attached, it lacks a chiral center. (Correct)

E. Cysteine's side chain is a thiol group ( $-CH₂-SH$ $-\mathrm{CH_2-SH}$), not a thioether ( $MeS-CH₂-CH₂-$ $\mathrm{MeS-CH_2-CH_2-}$ which belongs to Methionine). So statement E is incorrect.

Correct statements: A and D.

Chapter Mix

Class 12 Chemistry: Biomolecules

More Biomolecules Previous-Year Questions — Page 8

Q78 jee_main_2024_31_jan_morning Reactions of Glucose

Match List I with List II

LIST-I	LIST-II
A. Glucose/ $NaHCO₃$ $NaHCO_3$/ $Δ$ $\Delta$	I. Gluconic acid
B. Glucose/ $HNO₃$ $HNO_3$	II. No reaction
C. Glucose/HI/ $Δ$ $\Delta$	III. n-hexane
D. Glucose/Bromine water	IV. Saccharic acid

Choose the correct answer from the options given below:

A. $A-IV, B-I, C-III, D-II$ $\text{A-IV, B-I, C-III, D-II}$
B. $A-II, B-IV, C-III, D-I$ $\text{A-II, B-IV, C-III, D-I}$
C. $A-III, B-II, C-I, D-IV$ $\text{A-III, B-II, C-I, D-IV}$
D. $A-I, B-IV, C-III, D-II$ $\text{A-I, B-IV, C-III, D-II}$

Solution

Core Logic

Matching the reactions of glucose: (A) Glucose does not react with $NaHCO₃$ $NaHCO_3$, so there is no reaction. (A $arrow$ $\rightarrow$ II) (B) Oxidation of glucose with strong oxidizing agents like $HNO₃$ $HNO_3$ yields a dicarboxylic acid called saccharic acid. (B $arrow$ $\rightarrow$ IV) (C) Prolonged heating of glucose with $HI$ $HI$ forms n-hexane, indicating a straight chain of six carbon atoms. (C $arrow$ $\rightarrow$ III) (D) Oxidation with mild agents like bromine water converts glucose to gluconic acid. (D $arrow$ $\rightarrow$ I)

Chapter Mix

Class 12 Chemistry: Biomolecules

Solution & Explanation

Core Logic

Chapter Mix

Reference Study Guides

More Biomolecules Previous-Year Questions — Page 8

Solution

Core Logic

Chapter Mix

More Biomolecules Questions — jee_main_2026_21_jan_morning

Select Your Target Exam

Full Mock Test Hub

Topic-wise Practice Hub

Exam Analysis Tools

Chapter Weightage & Trends

Topic-wise Practice Hub

JEE Main Exam Papers

Chapter Weightage Board

Formula Recognition

Exam Questions

Select an Exam

Solution & Explanation

Core Logic

Chapter Mix

Reference Study Guides

More Biomolecules Previous-Year Questions — Page 8

Solution

Core Logic

Chapter Mix

More Biomolecules Questions — jee_main_2026_21_jan_morning

Select Your Target Exam

Full Mock Test Hub

Topic-wise Practice Hub

Exam Analysis Tools

Chapter Weightage & Trends

Topic-wise Practice Hub

JEE Main Exam Papers

Chapter Weightage Board

Formula Recognition

Exam Questions

Select an Exam

Welcome back