Question

write Reactions involving retention of diazo

group: Coupling reactions​

Answer 1

Answer:

Reactions involving retention of Diazo group are coupling reaction. Arenediazonium salts reacts with highly reactive aromatic compounds such as phenols and amines to form brightly coloured azo compounds, Ar-N=N-Ar. ... Mostly such compounds are used in the manufacture of dyes, as this compounds are coloured in nature.

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Answer 2

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Arenediazonium salts when treated with certain reactive aromatic compounds such as phenols or aromatic amines, give azo compounds. These have extended conjugated system of double bonds in which two aromatic rings are joined through azo group -N=N-. This reaction is called azo coupling. Azo compounds are brightly coloured and are used as dyes. This is an example of electrophilic aromatic substitution reaction. Here the electrophiles are positively charged diazonium ions. Substitution usually occurs para to the ring activating group. For example : Benzenediazonium chloride reacts with phenol in mild alkaline medium to give p-Hydroxy-azobenzene (orange dye).

Azo coupling with b-naphthol in NaOH is used as a confirmatory test for primary aromatic amines. Benzenediazonium chloride reacts with aniline in mild alkaline medium to give p-aminoazo-benzene (yellow dye.)