$Hexane \underset{773 K, 10-20 atm}{\overset{C{r}_2{O}_3, }{\to }} X \underset{AlC{l}_3}{\overset{C{H}_{3}COCl}{\to }}Y$ . Y in the above sequence of reaction is

Given data: To find the product Y in the above reaction   

Detailed solution:

Hexane upon heating with $C{r_2}{O_3}$ at 773 K produces benzene

(${C_6}{H_6}$) which is compound X. The obtained benzene reacts with

$C{H_3}COCl$ in presence of $AlC{l_3}$ produces acetyl benzene

${C_6}{H_5}COC{H_3}$. Reaction of benzene with $C{H_3}COCl$ in presence of

$AlC{l_3}$  is called Friedel crafts acylation.

Hence the correct option is (D)