What is the best reagent for this transformation? H₂C H₂C a) (CH3CH₂CH₂)₂Culi d) BrCH=CHCH3 a) O d b) H₂C H₂C -CH3 b) Ph3P=CHCH₂CH3 d) CH3CH₂CH₂OH, H* c) CH3CH₂CH₂MgBr

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