Benzoic acid is treated with thionyl chloride to give compound Q which is converted to benzaldehyde

Question

Benzoic acid is treated with thionyl chloride to give compound Q which is converted to benzaldehyde as shown below. What reagent is required to convert Q to benzaldehyde? $$ \mathrm{PhCOOH} \rightarrow \mathrm{Q} \rightarrow \mathrm{PhCHO} $$

Professor PC Thomas Classes · Answer

Rosenmund reduction uses $	ext{H}_2/	ext{Pd-BaSO}_4$.