The  reaction of compound  P with  CH3MgBr (excess) in (C2H5)2O followed by addition of H2O gives Q. The compound Q on treatment with H2SO4 at 0°C gives R. The reaction of R with CH3COOl in the presence of  anhydrous AlCl3 in CH2Cl2 followed by treatment with H2O produces compound S. [Et in compound P is ethyl group]  The reactions, Q to R and R to S, areThe Product S is