The catalyst $SnCl_2/HCl$ is used in:

The reaction of benzene with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ gives a compound $X$. $X$ can also be obtained from which of the following reactions?

Identify the product formed when benzoyl chloride is reduced by hydrogen using a palladium catalyst poisoned with barium sulphate.

In the reaction $CH_3CN + 2H \underset{\text{Ether}}{}$ ${\xrightarrow{HCl}} X$ $\xrightarrow{\text{Boiling } H_2O} Y$; the product $Y$ is

The correct match between Item-$I$ (starting material) and Item-$II$ (reagent) for the preparation of benzaldehyde is :

Item-$I$	Item-$II$
$I$. Benzene	$P$. $HCl$ and $SnCl_2, H_3O^{+}$
$II$. Benzonitrile	$Q$. $H_2, Pd-BaSO_4, S$ and quinoline
$III$. Benzoyl Chloride	$R$. $CO, HCl$ and $AlCl_3$

Which reagent is useful in the conversion of ethanenitrile to ethanal?