An amine $(X)$ reacts with $p$-toluene sulphonyl chloride to give the product $Y$, which is insoluble in alkali. The product of $X$ with benzoyl chloride is

$$ \text { In the given reaction, what is } X \text { ? } $$

Which of the following reactions are used in the preparation of aliphatic primary amines?

I. Gabriel's phthalimide reaction

II. Hoffmann bromamide reaction

III. Carbylamine reaction

IV. Sandmeyer reaction

In the following sequence of reaction, identify the major product $B$.