**Question**

  [![cyclopent-2-en-1-one and gilman's reagent with acid workup][1]][1]

**Attempt**

It seems to me that the carbon-oxygen bond would be more electrophilic due to the higher electronegativity of oxygen. Hence I believe $\ce{CH3-}$ should attack the carbonyl site. But this doesn't seem to be the case.

Is it because that the intermediate carbanion can undergo resonance with oxygen, had $\ce{CH3-}$ attacked carbon- carbon double bond?

What can be a valid reason?


  [1]: https://i.sstatic.net/NkI1L.png