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JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

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Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom.

Reason R : A molecule with 2 chiral carbons is always optically active.

In the light of the above statements, choose the correct answer from the options given below :
  1. (A)A is false but R is true.
  2. (B)A is true but R is false.✓ Correct
  3. (C)Both A and R are true and R is the correct explanation of A .
  4. (D)Both A and R are true and R is NOT the correct explanation of A .

Answer: (B)

Solution

Assertion A is true. When glycine reacts with chlorine in the presence of red phosphorus (Hell-Volhard-Zelinsky reaction), the α-hydrogen is replaced by chlorine, creating a chiral carbon atom in the product α-chloro amino acid.

Reason R is false. A molecule with 2 chiral carbons is not always optically active; meso compounds have two chiral centers but possess a plane of symmetry, making them optically inactive.

JEE Main · 2023 · 11 Apr 2023 · Shift 2 · Single correct option

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