Which of the following reactions does not rep | vedclass

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(D) Aldol condensation is a reaction in which aldehydes or ketones containing at least one $\alpha$-hydrogen atom undergo self-condensation or cross-c

Vedclass · Accepted Answer

Formaldehyde with concentrated $NaOH/\Delta$

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(D) Aldol condensation is a reaction in which aldehydes or ketones containing at least one $\alpha$-hydrogen atom undergo self-condensation or cross-condensation in the presence of a dilute alkali (like dilute $NaOH$ or $Ba(OH)_2$) to form $\beta$-hydroxy aldehydes (aldols) or $\beta$-hydroxy ketones (ketols),which upon heating undergo dehydration to form $\alpha,\beta$-unsaturated carbonyl compounds.$A$,$B$,and $C$ represent standard aldol condensation reactions because the reactants possess $\alpha$-hydrogen atoms.Option $D$ involves formaldehyde $(HCHO)$,which does not contain any $\alpha$-hydrogen atom. In the presence of concentrated $NaOH$,formaldehyde undergoes the Cannizzaro reaction (a disproportionation reaction) rather than aldol condensation. Therefore,it does not represent an aldol condensation reaction.

Which of the following reactions does not represent the aldol condensation reaction?

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