Write the structure and names of compounds formed when compound $\mathrm{A}$ with molecular formula ${\mathrm{C}}_7{\mathrm{H}}_8$ is treated with ${\mathrm{Cl}}_2$ in the presence of ${\mathrm{FeCl}}_3$.

What happens, when ${\mathrm{SO}}_2$ is passed through an aqueous solution of $\mathrm{Fe}\left(\mathrm{III}\right)$ salts?

Write the balanced chemical equations for the following :

Reaction of silver nitrate with hypophosphorous acid in aqueous medium.