Phenol is formed.

• When benzene diazonium chloride is heated with water, Phenol is formed along with the by-products, Nitrogen gas and Hydrochloric acid.

• The chemical reaction involved is:

• This reaction is commonly used for the synthesis of phenol from Aniline. When Aniline is treated with NaNO₂/ HCl, a Diazonium salt is formed.