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  4. Claisen condensation is not given by

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Q. Claisen condensation is not given by

Bihar CECEBihar CECE 2008

Solution:

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.
image
$\alpha, \beta$ -unsaturated carbonyl compound
Claisen condensation is not given by
image
as it does not contain $\alpha$ -hydrogen atom.