Which of the following order is correct?

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 ortha and para positions w.r.t chiorine 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)`