Treatment of benzene with CO/HCl in the presence of anhydrous ${\text{AlCl}}_3/\text{CuCl}$ followed by reaction with $A{c}_2\text{O}/\text{NaOAc}$ gives compound X as the major product. Compound X upon reaction with $B{r}_2/N{a}_{2}C{O}_3$, followed by heating at 473 K with moist KOH furnishes Y as the major product. Reaction of X with $H_2/Pd-C$, followed by $H_{3}P{O}_4$ treatment gives Z as the major product.
The compound Y is

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