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Nucleophilic Substitution in Aryl Halides

Nitrobenzene ...

Question

Nitrobenzene gives azoxybenzene and hydrazobenzene when reduced:

in acidic medium

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in neutral medium

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electrolytically

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in alkaline medium

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Solution

The correct option is D in alkaline medium

When nitrobenzene is reduced in an alkaline medium, nitrosobenzene and phenylhydroxylamine are obtained. These intermediates react to form azoxybenzene.

Azoxybenzene on further reduction forms azobenzene and hydrazobenzene.

Option D is correct.

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