why is it easier to dehydrate aldol

Dear Student,

Aldol contains an alcohol as well as aldehydic group. Now, dehydration is elimination reaction. The alpha H in aldol, which is alpha to -OH is acidic as it is sandwiched between the -OH and carbonyl group. 
The carbonyl group is electron withdrawing and it makes the hydrogen acidic. This leads to the removal of -OH to give double bond. 
 

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An aldol condensation is a condensation reaction in organic chemistry in which an enol or an enolate ion reacts with a carbonyl compound to form a β-hydroxyaldehyde or β-hydroxyketone (an aldol reaction), followed by dehydration to give a conjugated enonev
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