Which of the following compounds reacts with $CHCl_3$ and $KOH$ to produce an isocyanide?

The major product in the following reaction is:

Identify the major product formed in the following reaction: $C_6H_5NH_2 + CHCl_3 + 3KOH \to ?$

Which one of the following compounds forms a quaternary salt on reacting with excess methyl iodide?

Identify the major product of the following reaction:

In the sequence of the following reactions,$X$ and $Y$ are respectively: $CH_3OH$ $\xrightarrow{HI} CH_3I$ $\xrightarrow{KCN} CH_3CN$ $\xrightarrow{\text{reduction}} X$ $\xrightarrow{HNO_2} Y$