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  4. A strong base can abstract an α-hydrogen from

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Q. A strong base can abstract an $\alpha$-hydrogen from

AIPMTAIPMT 2008Aldehydes Ketones and Carboxylic Acids

Solution:

Since the carbonyl carbon is electron deficient, so most susceptible to attack by nucleophilic reagents or base. A base increases the acidity of hydrogen atom attached to the $\alpha - C $ of the ketones or aldehydes.
That- why $\alpha$-hydrogen is easily abstracted from ketones by a base, e.g. in aldol condensation reaction, $\alpha$-hydrogen atom of aldehyde or ketone is abstracted by a strong base.