Question

give conversion of nitrobenzene to phenyl isocyanide​

Answer 1

Not too tough. Treat aniline with chloroform and base (KOH) as shown:

There are other ways, too.

Answer 2

$C_6H_5-NH_2 + CHCl_3 + 3KOH$ → $C_6H_5-NC + 3KCl + 3H_2O$

Explanation:

When aniline is heated along with Chloroform in the presence of a base KOH  phenyl isocyanide is formed.

The reaction is as follows -

$Ph-NH_2 + CHCl_3 + KOH$ → $Ph-NC + KCl + H_2O$

The balanced chemical reaction is as follows -

$C_6H_5-NH_2 + CHCl_3 + 3KOH$ → $C_6H_5-NC + 3KCl + 3H_2O$

Here, the product formed is Phenyl isocyanide or iso-cyano-benzene with the side products of water and KCl.

This reaction is known as Carbylamine Reaction.

It’s also used to test for primary amines.