Identify the name reaction shown in the following chemical equation:

Which of the following is a Stephen reaction?

$R-CN \xrightarrow[(ii) H_2O]{(i) DIBAL-H} R-Y$
Consider the above reaction and identify $Y$.

$R-C \equiv N + SnCl_2 + HCl$ $\longrightarrow A$ $\xrightarrow{H_3O^+} RCHO$. The above reaction is known as:

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 of the following reactions will give benzophenone as the major product?
$(A)$ Benzoyl chloride $+$ Benzene $+ AlCl_3$ (anhydrous)
$(B)$ Benzoyl chloride $+$ Phenylmagnesium bromide (excess)
$(C)$ Benzoyl chloride $+$ Diphenyl cadmium