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JEE Main 2026 Apr 6 Shift 1, Chemistry Q20: Proteins

JEE Main2026Apr 6, Shift 1Chemistry
Q.

Match the List-I with List-II:

List-I (Amino acid)List-II (Positive reaction/Test for functional group present in side chain)
A.GlutamineI.Hinsberg's test
B.LysineII.Neutral FeCl test
C.TyrosineIII.Ceric ammonium nitrate test
D.SerineIV.Hoffman bromamide degradation

Choose the correct answer from the options given below:

  1. A

    A-IV, B-II, C-I, D-III

  2. B

    A-IV, B-I, C-II, D-III

  3. C

    A-III, B-II, C-I, D-IV

  4. D

    A-IV, B-I, C-III, D-II

Solution

Identify the functional group on each side chain and match the diagnostic reaction:

Glutamine: side chain has a primary amide (). Primary amides undergo Hofmann bromamide degradation with Br/NaOH. IV.

Lysine: side chain has a primary amine (). Primary amines give a positive Hinsberg's test. I.

Tyrosine: side chain has a phenolic -OH, which gives a coloured complex with neutral FeCl. II.

Serine: side chain has an aliphatic alcohol -OH, which gives a positive ceric ammonium nitrate test. III.

A-IV, B-I, C-II, D-III.

Concept behind this question

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