Paragraph: Treatment of benzene with $\text{CO}/\text{HCl}$ in the presence of anhydrous $\text{AlCl}_3/\text{CuCl}$ followed by reaction with $\text{Ac}_2\text{O}/\text{NaOAc}$ gives compound X. X upon reaction with $\text{Br}_2/\text{Na}_2\text{CO}_3$, followed by heating at 473 K with moist $\text{KOH}$ furnishes Y. Reaction of X with $\text{H}_2/\text{Pd-C}$, followed by $\text{H}_3\text{PO}_4$ treatment gives Z.

The compound Y is: