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Aniline is an activated system for electrophilic substitution. The compound formed on heating aniline with acetic anhydride is

1. COCH3 attached to NH2 group
2. COCH3 attached to benzene ring
3. COCH3 attached to NH2 group and benzene ring
4. NHCOCH3 attached to benzene ring

Correct answer: NHCOCH3 attached to benzene ring

Solution

When aniline reacts with acetic anhydride, the acetylation of the -NH2 group occurs, forming acetanilide (NHCOCH3 attached to the benzene ring). This reaction reduces the activating effect of the amino group.

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