Acetamide is

In the reaction of hypobromite with amide,the carbonyl carbon is lost as :

In the series of reactions: $C_6H_5NH_2$ $\xrightarrow{NaNO_2/HCl}_{0 - 5\ ^\circ C} X$ $\xrightarrow{HNO_2}_{H_2O} Y + N_2 + HCl$. $X$ and $Y$ are respectively:

If aniline is treated with conc. $H_{2}SO_{4}$ and heated at $200^{\circ}C$, the product is

The final product $(IV)$ obtained in the reaction sequence
Toluene $\xrightarrow[{2. \ H^{+}}]{{1. \ KMnO_4/OH^{-}}} I$ $\xrightarrow{{SOCl_2}} II$ $\xrightarrow{{NH_3}} III$ $\xrightarrow{{OBr^{-}}} IV$ is

The reaction of $HNO_2$ with $A$ gives a quaternary ammonium salt. $A$ is