Name the following reaction: $C_6H_5COCl + H_2 \xrightarrow{Pd-BaSO_4} C_6H_5CHO + HCl$

What are $X$ and $Y$ in the following reactions?

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 reagent from the following is used for the preparation of aliphatic aldehyde from nitriles?

The reagents used in the Etard reaction $(I)$ and the Stephen reaction $(II)$ are:

The oxidation of toluene to benzaldehyde by chromyl chloride $(CrO_2Cl_2)$ is called: