Oxidation of toluene with ${\mathrm{CrO}}_3$to benzaldehyde is carried out in the presence of acetic anhydride. Explain why.

In the reaction ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COCl}\underset{{\mathrm{H}}_2}{\overset{\mathrm{Pd}/{\mathrm{BaSO}}_4}{\to }}\mathrm{X}$,  the $\mathrm{X}$ is

The major product of the following reaction is:

Write chemical equations for the following reaction :

Benzoyl chloride is hydrogenated in presence of $\mathrm{Pd}/{\mathrm{BaSO}}_4$.

Write structures of compound A and B in the following reaction.

Complete the following reaction :

${\left({\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\right)}_2\mathrm{Cd}+2{\mathrm{CH}}_3\mathrm{COCl}$

The major product of the following reaction is,