Question

Claisen condensation is not given by

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

In Claisen condensation aromatic aldehydes having no $\alpha$ -hydrogen atom react with aldehyde, ketones or esters having $\alpha$ -hydrogen atom in presence of dilute alkali to form $\alpha ,\beta$ -unsaturated carbonyl compound.

$\alpha ,\beta$ -unsaturated carbonyl compound
Claisen condensation is not given by

as it does not contain $\alpha$ -hydrogen atom.