The high melting point and insolubility in organic solvents of sulphanilic acid are due to its $......$ structure.

Consider the following sequence of reactions. The percentage of nitrogen in the yellow product $(X)$ formed is . . . . . . %. (Nearest Integer) (Given Molar mass in g mol$^{-1}$ $H$:$1$, $C$:$12$, $N$:$14$)

Identify the final product $Z$ in the following reaction sequence:
$Aniline$ $\xrightarrow{CH_3COCl} X$ $\xrightarrow{Br_2/AlBr_3} Y$ $\xrightarrow{H_3O^+} Z$

When an organic compound was treated with sodium nitrite and hydrochloric acid in the ice-cold condition,nitrogen gas was evolved copiously. The compound is

Aniline with solid $KOH$ and $CS_2$ gives :

Which among the following is a correct order of $pK_b$ values of amines in the aqueous phase?