Question

Match List-I with List-II:

List-I (Amino Acid)	List-II (Nature of Amino Acid)
(A) Valine	(I) Basic amino acid
(B) Glycine	(II) Neutral optically active amino acid
(C) Lysine	(III) Acidic amino acid
(D) Glutamic acid	(IV) Neutral optically inactive amino acid

Choose the correct answer from the options given below:

• (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (I), (B) - (III), (C) - (IV), (D) - (II)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)

Answer 1

The Correct Option is D

To correctly match List-I (Amino Acids) with List-II (Nature of Amino Acid), we must first understand the properties of each amino acid.

1. Valine: This is a branched-chain amino acid and an essential amino acid. It is neutral (not acidic nor basic) and optically active.
2. Glycine: The simplest amino acid, having just a hydrogen atom as its side chain, making it optically inactive (no chiral center) and neutral.
3. Lysine: Known for having a long side chain ending in an amine group, which makes it a basic amino acid.
4. Glutamic Acid: It has acidic properties due to its carboxyl side chain.

Based on these properties, we can match each amino acid with its correct nature:

List-I (Amino Acid)	List-II (Nature of Amino Acid)
(A) Valine	(II) Neutral optically active amino acid
(B) Glycine	(IV) Neutral optically inactive amino acid
(C) Lysine	(I) Basic amino acid
(D) Glutamic acid	(III) Acidic amino acid

This alignment matches the given correct answer: (A) - (II), (B) - (IV), (C) - (I), (D) - (III).

Answer 2

(A) Valine: Valine is a neutral amino acid that is optically active, meaning it has a chiral center and can rotate plane-polarized light. So, it matches with (II).

(B) Glycine: Glycine is the only neutral amino acid that is optically inactive because it does not have a chiral center. Therefore, it matches with (IV).

(C) Lysine: Lysine is a basic amino acid due to the presence of an amino group (-NH₂) in its side chain, making it capable of accepting protons. It matches with (I).

(D) Glutamic acid: Glutamic acid is an acidic amino acid because of the carboxyl group (-COOH) in its side chain. Therefore, it matches with (III).

Thus, the correct answer is Option D.

(A) - (II) (Valine: Neutral optically active)

(B) - (IV) (Glycine: Neutral optically inactive)

(C) - (I) (Lysine: Basic)

(D) - (III) (Glutamic acid: Acidic)