question_answer

Claisen condensation is not given by

A)  

B)   

C)  

D)  

Correct Answer: A

Solution :

Key Idea In Claisen condensation aromatic aldehydes haying no a-hydrogen atom react with aldehyde, ketones or esters having a-hydrogen atom in presence of dilute alkali to form \[\alpha ,\,\,\beta \]-unsaturated carbonyl compound. eg,                     \[\alpha ,\,\,\beta \]-unsaturated carbonyl compound Claisen condensation is not given by as it does not contain \[\alpha \]-hydrogen atom.