Name the catalyst used in the commercial preparation of phenol.

$X, Y$ and $Z$ in the following reaction sequence are

Phenol is obtained by heating an aqueous solution of:

Identify product $C$ in the following reaction sequence:
Nitrobenzene $\xrightarrow{Sn+HCl} A$ $\xrightarrow{HNO_2, 0^{\circ}C-5^{\circ}C} B$ $\xrightarrow{H_2O, \Delta} C$

What happens when benzene diazonium chloride is heated with water?

Hydrolysis of which compound will give carbolic acid?