Which reaction, intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde?
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Correct option is A)
The α- hydrogen atoms of acetaldehyde due to −E effect of C=O group is slightly acidic in nature. During the crossed aldol condensation between formaldehyde and acetaldehyde, in the first step, O− ion (from the base added) abstracts one of these acidic α-hydrogens to form carboanion or enolate ion which is stabilized by resonance.
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