In the following reaction,the product $(A)$ is a yellow dye. Identify $(A)$.

Which of the following is the most basic?

In the following reaction,
$C_6H_5NHCOC_6H_5 \xrightarrow[conc. \ H_2SO_4]{conc. \ HNO_3} X$
the structure of the major product $X$ is

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

The major product in the following reaction is:

Given below are two statements:
Statement $I$: Primary aliphatic amines react with $HNO_2$ to give unstable diazonium salts.
Statement $II$: Primary aromatic amines react with $HNO_2$ to form diazonium salts which are stable even above $300 \ K$.
In the light of the above statements,choose the most appropriate answer from the options given below: