Can you explain the answer of this question below:
In which of the following molecules, the mesomeric effect does not operate?
  • A:
  • B:
  • C:
  • D:
The answer is a.

Chemistry Question

By Partha Meher · Jun 29, 2018 ·Chemistry
9 Answers
Srijan Sengupta answered Jun 29, 2018
In option a the N atom is sp3 hybridised, and it has no vacant orbital to accept electron cloud from Ph ring......also this N atom does not have any lone pair of electrons to take part in conjugation with Ph ring.....so mesomeric effect does not operate here

Megha Swami answered Jul 10, 2018
Then why not c

Sateex answered Oct 18, 2018
The answer couldn't be "B/C" since there is conjugation which can lead to resonance; The answer also couldn't be "D" since Nitrogen has lone pair which go into conjugation; So finally the answer is "A" (Because Nitrogen is lacking electrons there and alkyl groups will donate electrons to satisfy electron deficiency at N).

Aamir Institute answered Feb 21, 2020
In option 'A'  the N atom is sp3 hybridised, and it has no vacant orbital to accept the electrons from benzene ring. Also this N atom does not have any lone pair of electrons to take part in conjugation with Ph ring. So mesomeric effect does not operate here.

Virendra Kumar answered Jul 07, 2019
When N atoms gains positive charge +I effect of R stabalise this

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