Which reagent,when reacted with a primary amine,evolves nitrogen gas?

Which of the following is the weakest base?

Which of the following will be the most stable diazonium salt $(R-N_2{^+} X^{-})$?

In the carbylamine reaction,the number of moles of $KOH$ and $CHCl_3$ used per mole of isocyanide produced are $X_1$ and $X_2$ respectively. Find out $X_1 - X_2$.

Identify $(a)$ and $(b)$ in the following reaction:
$CH_3CH_2NH_2 + CHCl_3 + 3KOH \rightarrow (a) + (b) + 3H_2O$

The compound $X (C_{7}H_{9}N)$ reacts with benzene sulphonyl chloride to give $Y (C_{13}H_{13}NO_{2}S)$ which is insoluble in alkali. The compound $X$ is