An enolate attacks an aldehyde and the resulting product is subsequently protonated. What type of reaction is this? A) a Fischer esterification
B) an acid-catalyzed aldol condensation
C) a base-mediated aldol condensation
D) a Hell-Volhard-Zelinsky reaction
E) a Selman-Jones reaction

C) a base-mediated aldol condensation .

Explanation:

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In this case, an aldol condensation is a condensation organic reaction whereby an enol or an enolate ion reacts with a carbonyl compound (from a ketone or aldehyde) to form a β-hydroxyaldehyde or β-hydroxyketone or more specifically an aldol reaction.

Afterwards, it is followed by dehydration in order to yield conjugated enone which is also evidencing a protonation.

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