Question

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is

• A. $-C_2{H}_5$
• B. $-{HO}_5$
• C. $-CI$
• D. $-{NH}_2$

Answer 1

Answer: (C)

$-CI$

$-N{H}_{2}and-N{H}_{2}COC{H}_3$ are activating group and $-N{O}_2$ is deactivating group. $-Cl$ is deactivating group due to its $-I$ effect but it direct electrophile to ortho and para position due to $+M$ effect