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(B) The aldol condensation of an aldehyde involves the formation of a carbanion as the reaction intermediate in the first step. This occurs by the rem

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$A$ carbanion

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(B) The aldol condensation of an aldehyde involves the formation of a carbanion as the reaction intermediate in the first step. This occurs by the removal of an $\alpha-H$ atom from the aldehyde by a base (e.g.,$OH^-$). The resulting enolate ion is resonance-stabilized as shown below: $OH^- + CH_3CHO \rightleftharpoons H_2O + [CH_2-CHO]^- \leftrightarrow [CH_2=CH-O]^-$

Aldol condensation of acetaldehyde involves the formation of which of the following intermediates?

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