Identify the product 'Y' in the following reaction $\text{Benzonitrile} \xrightarrow{\large{\text{C}_6\text{H}_5\text{MgBr} / \text{dry ether}}} X \xrightarrow{\large{\text{H}_3\text{O}^+}} Y + \text{MgBr(OH)} + \text{NH}_3$

Identify the main product of following reaction

Which from following amines when heated with ethanolic KOH and chloroform forms aryl isocyanide ?

Identify false statement from following regarding preparation of amines by Hofmann degradation method.