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
CH3COCl 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, are: