Question

Which of the following group attached to benzene act as meta directing group

• A. $-R$
• B. $-NH_{2}$
• C. $-X$
• D. $-NR_{3}^{+}$

Hint:

Strong electron withdrawing groups usually show meta directing effect.

Answer 1

The Correct Option is D

Concept:
Groups attached to benzene ring influence position of incoming substituent during electrophilic substitution.
Step 1:
Electron withdrawing groups generally direct incoming group to meta position.
Step 2:

• $-R$ is electron donating
• $-NH_{2}$ is strong activating ortho-para directing group
• Halogens (\(-X\)) are ortho-para directing
Step 3:
\[ -NR_{3}^{+} \] has positive charge and strongly withdraws electrons. Thus it acts as meta director.
Step 4:
Hence correct answer is: \[ \boxed{-NR_{3}^{+}} \] \[ \boxed{\text{Correct Option = (4)}} \]