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Which reactive intermediate is formed du...

Which reactive intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde ?

A

`:overset(-)CH_(2)CHO`

B

`overset(+)CH_(2)CHO`

C

`overset(+)CH_(2)OH`

D

`:overset(-)CH_(3)CHO`.

Text Solution

Verified by Experts

The correct Answer is:
A
In crossed aldol condensation between formaldehyde and acetaldehyde, `alpha`-hydrogen atoms of acetaldeyde, due to `-E` effect of `gtC=O` group is slightly acidic in nature. In the first step `OH^(-)` ion (from the base added) abstracts one of these acidic `alpha`-hydrogens to form carbanion or enolate ion which is stabilised by resonance.
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