Q13 / 75 · JEE Main 2020 (03 Sep Shift 2) · Chemistry

The decreasing order of reactivity of the following compounds towards nucleophilic substitution ( $S_{N} 2$ ) is:

Solution

$Rate of S_{N} 2 reation α Electrophilicity of alkyl carbon α \frac{1}{Steric crowding on R - X}$

$S_{N} 2$ reaction depend upon $- I, - M$ , effect. $- I, - M$ group increases the rate of $S_{N} 2$ reaction.

Hence, the correct answer is option: 'B'.