Find $A$ in the reaction $R-NH_2 + A \longrightarrow$ Schiff base.

$RCOCl + 2Me_2NH \to A + Me_2NH_2^+Cl^-$. Here $A$ is:

Action of $HNO_2$ on $CH_3NH_2$ gives the following as the major product:

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

Consider the following reaction. What is the major product formed?
$[CH_3CH_2CH_2-N^+(CH_3)_2-CH_2CH_3] OH^- \xrightarrow{\text{Heat}}$

The basic character of ethylamine,diethylamine,and triethylamine in chlorobenzene is: