In the reaction $RMgBr + HC(OEt)_3 \xrightarrow{Ether, H_3O^{+}} P$, the product $P$ is

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

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

The conversion,$PhCN \to PhCOCH_3$,can be achieved most conveniently by reaction with

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

Which one of the combinations will give propanaldehyde on dry distillation?