reactions of benzene diazonium salt

Replacement reaction of benzene diazonium chloride by  cyanide ion

  Benzene diazonium salt with cuprous cyanides in presence of potassium cyanide gives cyanobenzene (benzene nitrile)Cyanobenzene formed can be converted to benzoic acid by hydrolysis. This method is used to introduce-COOH group in aromatic ring.

Replacement reaction of benzene diazonium chloride by  OH - ion

Aromatic diazonium salts are unstable and hence easily decompose when warned with water forming phenol and nitrogen gas.


Replacement reaction of benzene diazonium chloride by  hydrogen

Reducing agents like hypo phosphorous acid can replace diazonium group with hydrogen atom producing arene.


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