Question

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

• A. $-NO_2$
• B. $-C = N$
• C. $-SO_3 H$
• D. $-COOH$

Answer 1

Answer: (A)

$-NO_2$

Answer 2

Deactivating power :
${ - NO_2 > -C \equiv N > \- SO_3 H > COOH}$