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Claisen condensation is not given by...

Claisen condensation is not given by

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D

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The correct Answer is:
D
In Claisen condensation aromatic aldehydes having no `alpha` -hydrogen atom react with aldehydes, ketones or esters having `alpha`-hydrogen atoms in presence of dilute alkali to form `alpha, beta` -unsaturated carbonyl compound. It is not given by as it does not have `alpha`-hydrogen atom.
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