The order of basicity of ethyl amines in an aqueous solution is:

Nitrobenzene on reduction with zinc and $NH_4Cl$ gives:

Given below are two statements:
Statement $I$: Pure Aniline and other arylamines are usually colourless.
Statement $II$: Arylamines get coloured on storage due to atmospheric reduction.
In the light of the above statements,choose the most appropriate answer from the options given below:

Carbylamine is formed from aliphatic or aromatic primary amine via which of the following intermediates?

Identify $A$ and $B$ in the following reactions:

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