Saved Bookmarks
| 1. |
Give preparation of phenol from benzene sulphonic acid and benzene diazonium chloride. |
Answer» Solution :(i) From benzenesulphonic acid : Benzene is sulphonated with oleum and benzene sulphonic acid so formed is converted to SODIUM phenoxide on heating with molten sodium hydroxide. Acidification of the sodium salt gives phenol.  (ii) From benzene diazonium salt : A diazonium salt is formed by treating an aromatic primary amine with nitrous acid (`NaNO_(2)` + HCl) at 273-278 K. Diazonium salts are HYDROLYSED to phenols by WARMING with water or by treating with dilute acids. 
|
|