What is the physical state of pure aniline?

Identify substrate $A$ in the following conversion.
$A + \underset{\text{(excess)}}{CH_3 I} \xrightarrow{\Delta} C_2 H_5(CH_3)_3 N^+ I^-$

In the chemical reactions,the compounds $A$ and $B$ respectively are

The major product formed in the following reaction is:

When propionamide reacts with $Br_2$ in the presence of alkali the product is :

Identify $A$ in the following reaction.