Write an equation for a coupling reaction.

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Solution

Phenol couples with benzene diazonium chloride in alkaline medium to form p-hydroxy azobenzene Diazonium ion $C_{6} H_{6} N = N^{+}$ is the electrophile in this reaction.
This is also called dye test which is characteristic of phenol.

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Write an equation for a coupling reaction.

Phenol couples with benzene diazonium chloride in alkaline medium to form p-hydroxy azobenzene Diazonium ion C6H6N=N+ is the electrophile in this reaction.This is also called dye test which is characteristic of phenol.

Phenol couples with benzene diazonium chloride in alkaline medium to form p-hydroxy azobenzene Diazonium ion $C_{6} H_{6} N = N^{+}$ is the electrophile in this reaction.
This is also called dye test which is characteristic of phenol.