Which of the following compounds when treated with dibenzyl cadmium yields benzyl methyl ketone?

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

Identify product $A$ in the following reaction: $R-C \equiv N \xrightarrow[ii) H_{3}O^{+}]{i) DIBAl-H} A$

Which of the following reactions is best for the preparation of an aldehyde from a primary alcohol?

The reduction of benzoyl chloride with $Pd$ and $BaSO_4/CaCO_3$ produces :

What is the product formed on Rosenmund reduction of benzoyl chloride?