In which of the following is the nitrogen lone pair delocalised by resonance?

Apyrrole
B $CH X_{3} CONH X_{2}$
C $(CH X_{3}) X_{3} N$
D $C X_{6} H X_{5} NH X_{2}$

Answer: A, B, D

In aniline the lone pair is conjugated with the ring, in acetamide with the C=O, and in pyrrole it is part of the aromatic sextet. In trimethylamine the lone pair is on N with only sp3 carbons around it and is localised.

Practice General Organic Chemistry I: Electronic Effects More on Resonance: rules, conditions and drawing resonating structures

Previous questionNext question

In which of the following is the nitrogen lone pair delocalised by resonance?

Answer: A, B, D

More questions on Resonance: rules, conditions and drawing resonating structures