Question

Which of the following have +M effect ($\overline{e}$-donating mesomeric effect) ?

• A. $-N{O}_2$
• B. $-COOH$
• C. $-N{H}_2$
• D. $-SR$

Answer 1

Answer: (C), (D)

$-N{H}_2$
$-SR$

$-N{O}_2$ and $-COOH$ are electron withdrawing groups whereas $-N{H}_2$ and $-SR$ have +M effect ($\overline{e}$-donating mesomeric effect) due to presence of lone pairs of electrons.

Here (C) and (D) have LP $\overline{e}s-\ddot{N}{H}_2-\ddot{S}R$