Question

The substituent which is predominantly ortho-para directing but deactivating in aromatic electrophilic substitution reaction is :

• A. $-N{O}_2$
• B. $-OC{H}_3$
• C. $-C{H}_3$
• D. $-Cl$

Answer 1

Answer: (D)

$-Cl$

Chlorine atom is predominantly ortho-para directing because of its $+R$ effect and deactivating group because of its $-I$ effect in aromatic electrophilic substitutions.