The oxidation of toluene with air in the presence of $V_2O_5$ gives ...........

Which of the following compounds is obtained when toluene is treated with $CrO_2Cl_2$ in the presence of $CS_2$ followed by acid hydrolysis?

Chromyl chloride converts a methyl group to a chromium complex,which on acid hydrolysis gives the corresponding aldehyde. This reaction is called:

Enumerate different methods to prepare aldehyde compounds.

What is obtained when acetyl chloride is reduced in the presence of $BaSO_4$ and $Pd$?

Identify compound $(A)$ in the following reaction: