Propionic acid $\quad \underrightarrow{PCl_3}\quad X\quad\underrightarrow{C_6H_6}\quad Y$.In this sequence Y is

Question

$\begin{array}{1 1}(a)\;\text{Phenyl ethene ketone}&(b)\;\text{Phenyl acetate}\\(c)\;\text{Ethyl benzene}&(d)\;\text{Ethyl benzoate}\end{array}$