Which of the following does not give alcohol condensation reaction:

Explanation

The aldol condensation reaction involves the self-condensation of aldehydes (or sometimes ketones) containing an α-hydrogen (hydrogen atom directly attached to the carbon next to the carbonyl group). These hydrogens participate in nucleophilic attack and subsequent condensation steps.Formaldehyde (A), acetaldehyde (B), and propionaldehyde (D) all possess α-hydrogens. Therefore, they readily undergo aldol condensation, forming hydroxyaldehydes or β-hydroxyketones.Dimethyl ketone (C) lacks an α-hydrogen due to the two methyl groups directly attached to the carbonyl carbon. Without this crucial hydrogen, the nucleophilic attack and condensation steps necessary for the aldol reaction cannot occur.