Treatment  of  benzene  with  CO/HCl  in  the  presence  of  anhydrous  AlCl3/CuCl followed by reaction with Ac2O/NaOAc gives compound X as the major product. Compound X upon reaction  with Br2/Na2CO3, followed by heating at 473 K with moist KOH furnishes Y as the major product. Reaction of X with H2/Pd-C, followed by H3PO4  treatment gives Z as the major product. The compound Y isThe compound Z is