Question

Assertion :Statement-I : nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers.
Because Reason: Statement-II : The reaction occurs by $S_{N}1$ mechanism.

• A. (A)Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
• B. (B)Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.
• C. (C)Statement-I is true, Statement-II is false.
• D. (D)Statement-I is false, Statement-II is true.

Answer 1

The correct option is A (A)Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.

Statement-I : nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers.

Because Statement-II : The reaction occurs by $S_{N}1$ mechanism.

(A)Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.

$S_{N}1$ mechanism involves racemisation as the nucleophile can attack from either side. In $S_{N}2$ reaction, inversion of configuration is involved as the nucleophile can attack from opposite side.