Identify A and B in the following sequence of reaction

Toluene reacts with chlorine in the presence of light to give Benzal chloride. The reaction happens between methylbenzene and chlorine in the presence of ultraviolet light - typically sunlight. This is a good example of a photochemical reaction - a reaction brought about by light.

Benzyl chloride on reaction with ${\mathrm{H}}_2\mathrm{O}/373 \mathrm{K}$ gives benzaldehyde.