Identify the final product $A$ in the given reaction sequence.

Which of the following is obtained by hydrogenation of benzoyl chloride in the presence of $Pd$ on $BaSO_{4}$?

The catalyst $SnCl_2/HCl$ is used in:

Write the structures of products of the following reactions:
$(i)$ Benzene + $C_{2}H_{5}COCl$ $\xrightarrow{\text{Anhyd. } AlCl_{3}, CS_{2}}$
$(ii)$ $(C_{6}H_{5}CH_{2})_{2}Cd + 2 CH_{3}COCl \rightarrow$
$(iii)$ $H_{3}C - C \equiv C - H$ $\xrightarrow{Hg^{2+}, H_{2}SO_{4}}$
$(iv)$ $p$-Nitrotoluene $\xrightarrow{1. CrO_{2}Cl_{2}, 2. H_{3}O^{+}}$

The reagents/chemicals $X$ and $Y$ that convert cyanobenzene to a Schiff's base are:

The reagent used for the Gatterman-Koch formylation of arene is