Preference of grignard between aldehyde and double bond?

Quick question, in this reaction:


2-Butenal + CH3MgBr --> ??


Will the grignard attack the double-bond or the aldehyde carbon?
Please explain this preference, thanks!




The Grignard will first attack the aldehyde carbon, giving you a secondary alcohol. Since the alcohol is strongly polarized, it would be difficult for the double bond to be attacked.


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