Question

The formation of phenol from benzene diazonium chloride is a -------.
A. Hydrolysis reaction
B. Pyrolysis reaction
C. Photosynthesis reaction
D. Combustion reaction

Answer 1

Hint: The benzene diazonium chloride is going to be prepared from aniline by the reaction with hydrochloric acid and sodium nitrate.

Benzene diazonium chloride plays a big role in the synthesis of a variety of compounds where few substituents cannot be added directly on the aromatic ring through electrophilic substitution reactions.

Complete step by step answer:
- In the question it is given that phenol is prepared from benzene diazonium chloride. We have to find which type of reaction benzene diazonium chloride undergoes to form phenol.
- Benzene diazonium chloride on heating in presence of aqueous solution gives phenol as a main product and nitrogen gas a byproduct.

- Benzene diazonium chloride is hydrolyzed to phenols by treating it with dilute acids.
- Therefore the preparation of phenol from benzene diazonium chloride involves hydrolysis reaction.

- So, the correct option is A.

Additional information:
- Benzene diazonium chloride is ionic in nature (contains positive charge on nitrogen and a negative charge on chlorine).
- Benzene diazonium chloride is water-soluble.
- Benzene diazonium chloride is colorless and crystalline solid.
- Benzene diazonium chloride is soluble in water and reacts only when it is heated.


Note: Benzene diazonium chloride is useful in the synthesis of a variety of organic compounds particularly aryl derivatives. Benzene diazonium chloride used as an intermediate for introducing Fluorine, Bromo, Chloro and Iodo groups on the aromatic ring.