Aldehydes Ketones And Carboxylic Acids

Compound $\mathbf{P}$ is obtained by the hydrogenation of benzoyl chloride with Pd on $\mathrm{BaSO}_4$

On treating compound $\mathbf{P}$ with saturated $\mathrm{NaHCO}_3$ solution, brisk effervescence is observed

Compound $\mathbf{P}$ can be prepared by treating benzene with anhydrous $\mathrm{AlCl}_3$ and $\mathrm{CH}_3 \mathrm{COCl}$

On treating with bromine water, compound $\mathbf{P}$ gives a white precipitate