Reaction of primary amines with aldehydes yields

Arrange the following in increasing order of their boiling points:
$I.$ $N$-Ethylethanamine
$II.$ Butanamine
$III.$ $N,N$-Dimethylethanamine

How many amines with molecular formula $C_3H_9N$ can react with benzene sulphonyl chloride?

$RNH_2$ reacts with $C_6H_5SO_2Cl$ (Hinsberg reagent) in aqueous $KOH$ to give a clear solution. On acidification,a precipitate is obtained which is due to the formation of:

Which of the following is the correct order for basic strength?

Reaction of propanamide with $Br_2 / KOH \ (aq)$ produces :