Propanenitrile on reaction with ethylmagnesium iodide in the presence of dry ether gives an imine complex. This imine complex on acid hydrolysis forms:

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 $\xrightarrow{1. CrO_{2}Cl_{2}, 2. H_{3}O^{+}}$

Which,if any,of the following pairs of reagents could be used to prepare $2$-phenyl-$2$-butanol?

What is the product of the reduction of benzoyl chloride with $H_2/Pd-BaSO_4$?

Identify the major product $X$ formed in the following reaction:

In the reaction $C_6H_6 + CO + HCl \xrightarrow{A} C_6H_5CHO + HCl$,what is $A$?