The product obtained is/are

Compound $I$ is heated with Conc. $HI$ to give a hydroxy compound $A$ which is further heated with $Zn$ dust to give compound $B$. Identify $A$ and $B$.

Which of the following reacts with phenol to give salicylaldehyde after hydrolysis?

The structure of intermediate $A$ in the following reaction is

Identify $X$ and $Y$ in the following reactions:

Which reaction is used to prepare $2$-hydroxybenzaldehyde from phenol?