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Aniline in a set of the following reactions yielded a coloured product 'Y'. The structure of 'Y' would be:

1. N=N−CH3
2. HN−NH−CH3
3. CH3−N=N−NH2
4. CH3−N=N−CH3

Correct answer: CH3−N=N−CH3

Solution

Aniline reacts with methyl nitrite in acidic medium to form a diazonium salt, which couples with another molecule of methylamine to form the azo compound CH3−N=N−CH3 as the colored product.

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