Q. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
A) –C≡N
B) –SO₃H
C) –COOH
D) –NO₂
Explanation
[Solution from source] All four groups withdraw electrons and are meta directing, but –NO₂ deactivates the ring most strongly through its large −I and −R effects. –C≡N, –SO₃H and –COOH are deactivating but less so. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.