What is $A$ in the following reaction?

The product of the reaction is

Which of the following reagents is used in the Mendius reduction reaction of alkyl cyanide?

The product obtained by the reaction of ethyl chloride with potassium cyanide is reduced with sodium and alcohol to give ...............

In the reaction $CH_3COOH$ $\xrightarrow{PCl_5} (A)$ $\xrightarrow{NH_3} (B)$ $\xrightarrow{NaBrO} (C)$,the final product $(C)$ is

Suggest a route by which the following conversion can be accomplished: Cyclohexanecarboxamide to $N$-methylcyclohexanamine.