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Alpha Carbon would be better at forming Carbanion. You can see it in reactions like Aldol condensation, Claisen Ester condensation and acetoacetic ester synthesis reactions. Alpha carbon is depronated to form carbanion and that attacks the Carbonyl of a second molecule to form the product. Carbonyl is usually being attacked so I assume it has a partial positive charge on the carbon. Oxygen is pulling e- away from the carbon of the carbonyl, causing it to become more positive.