Acetophenone is prepared from

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

Which of the following reagents is used in the Etard reaction?

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

An acyl chloride is hydrogenated over a catalyst of palladium on barium sulphate to form an aldehyde. This reaction is called:

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