Question

Which of the following group(s) cannot participate in resonance with other suitable groups?

• A. -COOH
• B. -COCl
• C. $-\stackrel{\oplus }{N}{H}_3$
• D. $-\stackrel{\oplus }{C}{H}_3$
• E. $-C{H}_3$
• F. $C{H}_2=\stackrel{\oplus }{\underset{C{H}_3}{\underset{|}{N}}}-$
  

Answer 1

Answer: (A), (B), (C), (F)

The correct options are
A -COOH
B -COCl
C $-\stackrel{\oplus }{N}{H}_3$
F $C{H}_2=\stackrel{\oplus }{\underset{C{H}_3}{\underset{|}{N}}}-$

Options A,B,C,F are the answer.

Reason:- (Refer to Image) does not participate in resonance because carbon atom has no lone pair hence, it cannot form Resonating structure with suitable groups. In $-\stackrel{\oplus }{N}{H}_3$ or (Refer to Image 2) already complete its' octet rule hence does not participate in resonance. But $-\stackrel{\oplus }{N}{H}_3$ after removal of $H^{+}$ ion form the resonating structure.