Some meta- directing substituents in aromatic substitution are gi… - Vidyadip

MCQ

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

A
$- COOH$
✓
$- NO_2$
C
$- C\equiv N$
D
$- SO_3H$

✓

Answer

Correct option: B.

$- NO_2$

b
$-\mathrm{NO}_{2}$ is most deactivating due to - $\mathrm{I}$ and $-\mathrm{M}$ effect.

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