Arrange the compounds in increasing order of rate of reaction towards nucleophilic substitutions.

Options

A. (iii) `lt` (ii) `lt` (i)
B. (ii) `lt` (iii) `lt` (i)
C. (i) `lt` (iii) `lt` (ii)
D. (i) `lt` (ii) `lt` (iii)

Answer

D

Explanation

Presence of electron withdrawing group at ortho and para position facilitate the nucleophilic substitution reaction and hence, enhances rate of reaction. Compound (iii) has three electron withdrawing groups at ortho and para positions w.r.t. chlorine while compound (ii) has only one electron withdrawing group and there is no electron withdrawing group in compound (i). So, the increasing order of rate of reaction towards nucleophilic substitution is (i) `lt` (ii) `lt` (iii)