Question

Find out the major product from the following reaction.

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is C

Organocuprate Reaction Mechanism 

The reaction proceeds in two steps:

1. 1,4-addition of the organocuprate: The organocuprate reagent (MeMgBr/CuI) adds to the α, β-unsaturated ketone in a 1,4-conjugate addition manner. This results in the formation of a ketone with a methyl group at the β position.
2. Alkylation of the ketone: The resulting ketone reacts with n-propyl iodide (nPrI) in an alkylation reaction. The enolate of the ketone attacks the alkyl halide, adding the n-propyl group to the α-carbon.
   

Conclusion:

Therefore, the major product is option (3).