What is the number of moles of hydrogen atoms required to reduce one mole of nitroethane completely using $Sn$ and $HCl$?

Identify $Z$ in the following reaction:

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

$A$ compound $X$ with formula $C_4H_{11}N$ reacts with $HNO_2$ to liberate nitrogen and produce compound $Y$. The compound $Y$ on treatment with $I_2 / NaOH$ produces a sodium salt of a carboxylic acid. The compound $X$ is

Which of the following compounds is more basic than aniline?

The reaction of excess ethyl chloride with ammonia yields .................. .