In sandmeyer reaction, the reagent used is

In Gattermann reaction, the reaction mixture combines with

Nitrites are reduced to primary amines with the help of

The conversation of primary aromatic amines into diazonium salt is known as

The hybridisation of nitrogen in amines

When diazonium salt is allowed to rise up to 283 K, the salt gets hydrolysed to 

Benzene diazonium salt is

P-nitroaniline can be obtained by protecting NH₂ group of aniline by

Hofmann bromamide reaction is used for the preparation of