Question

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

• A. $-N{O}_2$
• B. $-C=N$
• C. $-S{O}_{3}H$
• D. $-COOH$

Answer 1

Answer: (A)

Deactivating power :
$-N{O}_2>-C\equiv N>-S{O}_{3}H>COOH$