Question

Give one method of preparation of benzene diazonium chloride , write the synthetic applications for the praparation of (a) chlorobenzene (b)phenol

Answer 1

The method of preparation of benzene diazonium chloride is:

Benzene diazonium chloride is prepared by diazotization of aniline in the presence of hydrochloric acid. The conversion involves in the production of nitrous acid (HNO2), which reacts with the aniline:
C₆H₅NH₂ + HNO₂ + HCl → [C₆H₅N₂]Cl + 2 H₂O

The method of preparation of Chlorobenzene is:

Chlorobenzene is prepared in the laboratory by Sandmeyer's reaction. The intermediate product is benzene diazonium chloride.

The method of preparation of Phenol is:

Chlorobenzene can be obtained by the monosubstitution of a benzene ring. When chlorobenzene fuses with sodium hydroxide at 320 atm & 623K, we obtain sodium phenoxide. Finally, sodium phenoxide on acidification gives phenols.