Secondary amines can be prepared by $:-$

Identify $B$ in the following conversion: $CH_3-I$ $\xrightarrow{KCN} A$ $\xrightarrow{Na / C_2H_5OH} B$

In a set of reactions,propionic acid yielded a compound $D$.
$CH_3CH_2COOH$ $\xrightarrow{SOCl_2} B$ $\xrightarrow{NH_3} C$ $\xrightarrow{KOH, Br_2} D$
The structure of $D$ would be

An organic compound $A$ on reaction with $NH_{3}$ followed by heating gives compound $B$. Which on further strong heating gives compound $C$ $(C_{8}H_{5}NO_{2})$. Compound $C$ on sequential reaction with ethanolic $KOH$,alkyl chloride and hydrolysis with alkali gives a primary amine. The compound $A$ is.

Which of the following nitrogen compounds gives a primary amine upon reaction with $Br_2$ and strong $KOH$ (Hofmann bromamide degradation reaction)?

What is the number of moles of $H$ atoms required to prepare one mole of ethylamine from one mole of acetamide?