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  4. Aldol condensation is given by

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Q. Aldol condensation is given by

COMEDKCOMEDK 2011Aldehydes Ketones and Carboxylic Acids

Solution:

Aldehydes and ketones having atleast one $\alpha$-hydrogen atom undergo a reaction in the presence of dilute alkali as catalyst to form $\beta$-hydroxy aldehydes (aldol) or $\beta$-hydroxy ketone? (ketol) respectively. This is known as aldol reaction. Benzaldehyde, formaldehyde and trichloroacetaldehyde do not give aldol condensation as they do not have $\alpha$-hydrogen atom