Question

Which of the following group(s) will not show $-R$ effect?

• A. $-CN$
• B. $-OH$
• C. $-COOH$
• D. $-N{O}_2$

Answer 1

The correct option is B $-OH$

The electron-withdrawing groups show the $-R$ effect. Therefore, $-CN$, $-COOH$ and $-N{O}_2$ groups will show $-R$ effect. So, the correct answer will be option (b).
$-OH$ group will show +R effect.