Q.
Consider the following set of reactions :
$CH_3COOH \xrightarrow{SOCl_2} A\xrightarrow[Anhyd. AlCl_3]{\text{Benzene}} B\xrightarrow{HCN} C \xrightarrow {HOH} D$
The structure of D would be
Solution:
$CH_3COOH \xrightarrow{SOCl_2} CH_3COCl\xrightarrow[{Anhyd. AlCl_3}]{\text{Benzene} }$(A)
