which of the following reagents adds a methyl group by conjugate(1,4-addition) addition to an alpha,beta-unsat

Question: which of the following reagents adds a methyl group by conjugate(1,4-addition) addition to an alpha,beta-unsaturated ketone or aldehyde? 1) LiCu(CH3)2 2) CH3MgBr 3) Hg(O2CCH3)2 4) CH3Li

Answer: The 1,4-addition (or Michael addition) is done by cuprates, therefore the right answer is (1). This said, under certain condition, Grignard reagents (2), can also work but under classic conditions, it will do a 1,2-addition. CH3Li would do a 1,2-addition and mercury acetate would not do anythin

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