When propanamide reacts with $Br_2$ and $NaOH$,which of the following compounds is formed?

Which of the following amines cannot be prepared by Gabriel phthalimide synthesis?

$Ph-C \equiv N$ $\xrightarrow[{Partial \ hydrolysis}]{H_3O^\oplus} (A)$ $\xrightarrow{Br_2 + KOH} (B)$
Product $(B)$ is

An organic compound $A$ upon reacting with $NH_3$ gives $B$. On heating $B$ gives $C$. $C$ in presence of $KOH$ reacts with $Br_2$ to give $CH_3CH_2NH_2$. $A$ is:

Identify the product obtained when nitroethane is treated with $Sn/HCl$ under ideal conditions.

The diazonium salts are the reaction products in the presence of excess of mineral acid with nitrous acid and: