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JEE Main202311 Apr 2023Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reasom 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 above statements, chose the correct answer from the options given

Options

  1. AA is true but R is false
  2. BBoth A and R are true but R is the correct explaination of A
  3. CA is false but R is true
  4. DBoth A and R are true but R is NOT the correct explaination of A

Correct answer

A. A is true but R is false

Step-by-step solution

When glycine is treated with chlorine in presence of red phosphorus, HVZ reaction takes place i.e., substitution of chlorine takes place at alpha carbon. A molecule with two chiral carbons is not always optically active. Suppose the following compound is having two chiral carbons but optically inactive due to internal compensation of optical rotation.

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