What is the nature of an aqueous solution of methylamine?

In the following reaction,the reason why the meta-nitro product is also formed is:

Which one of the following reactions does not occur?

The major product formed in the following reaction is

Identify the products $y$ and $x$ in the following reaction sequence:
$C_6H_5CONH_2 \xrightarrow{NaOBr} y$
$C_6H_5CONH_2 \xrightarrow[(ii) H_3O^+]{(i) C_6H_5SO_2Cl / py, \Delta} x$

$A$ compound of molecular weight $180$ is acetylated to give a compound of molecular weight $390$. The number of amino groups in the initial compound is: