Collin's reagent is

$C_6H_6 + CO + HCl \xrightarrow{\text{Anhy. } AlCl_3} X + HCl$. Compound $X$ is

Describe different methods for the preparation of ketones with suitable chemical reactions.

The reaction in which the methyl group on a benzene ring is converted to an aldehydic group is called:

Benzonitrile on reduction with stannous chloride $(SnCl_2)$ in the presence of hydrochloric acid $(HCl)$ followed by acid hydrolysis forms:

Benzyl chloride when oxidised by $Pb(NO_3)_2$ gives