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Explain the mechanism of Aldol condensa...

Explain the mechanism of Aldol condensation of acetaldehyde.

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This reaction is catalysed by base. The carbanion generated is nucleophilic in nature. Hence it can bring about nucleophilic attack on carbonyl group .
Step 1 : The carbanion is formed as the ` simga` - hydrogen atom is removed as a proton by the base.

Step 2 : The carbanion attacks the carbonyl carbon of another unionised aldehyde molecule .

Step 3 : The alkoxide ion formed is protonated by water to give 'aldol'.
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