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Chemistry Question 70 – JEE-MAIN 2026

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Match the LIST-I with LIST-II List-IList-IIAmino acidPositive reaction/Test for functionalgroup present in side chain ofamino acidA. GlutamineI. Hinsberg's testB. LysineII. Neutral FeCl3 testC. TyrosineIII. Ceric ammonium nitrate testD. SerineIV. Hoffman bromamide degradation Choose the correct answer from the options given below:

Identify the characteristic functional group present in the side chain of each given amino acid.

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Ninja Strategy•Functional Group Specificity

Each test is specific to a particular functional group. By correctly identifying just one or two matches, other options can be quickly eliminated due to incorrect functional group-test pairings.

Step 1: Identify functional groups in amino acid side chains✦ Active

First, identify the characteristic functional group present in the side chain of each amino acid:

A. Glutamine: Amide group (−CONH2)

B. Lysine: Primary amine group (−NH2)

C. Tyrosine: Phenolic hydroxyl group (−OH attached to benzene ring)

D. Serine: Primary alcohol group (−CH2OH)

💡 Teacher's Secret Hint

Remember the structures of common amino acids and their side chains.

Step 2: Associate functional groups with their characteristic tests○ Expand

Next, recall the specific chemical tests used to identify these functional groups:

I. Hinsberg's test: Used for primary, secondary, and tertiary amines. Primary amines react to form a sulfonamide soluble in alkali.

II. Neutral FeCl3 test: Used for phenols, which give a characteristic color (violet, blue, green, etc.).

III. Ceric ammonium nitrate test: Used for alcohols, which give a red color.

IV. Hoffman bromamide degradation: Used for primary amides, converting them to primary amines with one less carbon atom.

💡 Teacher's Secret Hint

Recall the specific reactions and reagents for different organic functional groups.

Step 3: Match amino acids to their respective tests○ Expand

Based on the functional groups and their tests, we can make the following matches:

A. Glutamine (Amide) → IV. Hoffman bromamide degradation

B. Lysine (Primary amine) → I. Hinsberg's test

C. Tyrosine (Phenol) → II. Neutral FeCl3 test

D. Serine (Primary alcohol) → III. Ceric ammonium nitrate test

This set of matches (A-IV, B-I, C-II, D-III) corresponds to option 2.

💡 Teacher's Secret Hint

Carefully cross-reference each amino acid with the correct test.

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