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NEET levelSingle correct optionDifficulty 1 of 3nc205

Azo dyes are characterised by the presence of the group

A $- NO X_{2}$ on an aromatic ring
B $- N = N -$ joining two aromatic rings
C $- N \equiv N X^{+}$ on an aromatic ring
D $- NH - NH X^{-}$ joining two aromatic rings

Answer: B

Azo compounds contain the N=N group between two aryl groups; the extended conjugation makes them coloured. -NH-NH- is the hydrazo group and N2+ is the diazonium group.

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