On prolonged heating of ammonium cyanate or urea,we get

When a concentrated solution of sulphanilic acid and $1-$naphthylamine is treated with nitrous acid $(273 \ K)$ and acidified with acetic acid,the mass $(g)$ of $0.1 \ mole$ of product formed is : (Given molar mass in $g \ mol^{-1} H: 1, C: 12, N: 14, O: 16, S: 32$)

The product formed from the following reaction sequence is:

The correct order of increasing basic nature for the bases $NH_3$,$CH_3NH_2$ and $(CH_3)_2NH$ is

The major product formed in the following reaction is:

$CH_3NH_2 + CHCl_3 + KOH \rightarrow$ Nitrogen containing compound $+ KCl + H_2O$. The nitrogen-containing compound is: