Aniline on treatment with excess of bromine water gives

On hydrolysis of a "compound",two compounds are obtained. One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollens reagent and Fehling's solution. The "compound" is

Which one of the following reactions does not occur?

What are $X$ and $Y$ in the following reactions?

Consider the following reaction. The product $X$ is used:

Which one of the following compounds gives carboxylic acid with $HNO_2$?