Answer:
Aldol condensation involves the
nucleophile attack of carbanion generated by one molecule of a particular
carbonyl compound on the other molecule. For this, the carbonyl compound must
have at least one \[\alpha \]-hydrogen present. Since formaldehyde (HCHO) has
no such hydrogen present, it fails to take part in aldol condensation. However,
it can participate in cross-aldol condensation along with another carbonyl
compound with at least one \[\alpha \]-hydrogen atom e.g. formaldehyde and
acetaldehyde.
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