Question

Towards electrophilic substitution, the most reactive is :

• A. anilinium chloride
• B. aniline
• C. N - acetylaniline
• D. nitrobenzene

Answer 1

The correct option is B aniline

In nitrobenzene, the electron withdrawing nitro group decreases the electron density.
In N - acetylaniline, the lone pair of electrons on N is in conjugation with acetyl group. This decreases, the electron density on benzene ring.
In anilinium chloride, the lone pair on nitrogen is donated to hydrogen. Nitrogen atom bears positive charge. This decreases the electron density on benzene.
Hence, the electron density on benzene ring is maximum in aniline. Hence, aniline is the most reactive towards electrophilic aromatic substitution.