Paragraph: The reaction of compound P with CH ₃ MgBr (excess) in ( C ₂ H ₅ )₂ O followed by addition of H ₂ O gives Q . The compound Q on treatment with H ₂ SO ₄ at 0^ C gives R . The reaction of R with CH ₃ COCl in the presence of anhydrous AlCl ₃ in CH ₂ Cl ₂ followed by treatment with H ₂ O produces compound S . [Et in compound P is ethyl group] Question: The product S is