Cinnamic acid from benzaldehyde would be prepared by which of the following reaction?

Perkin reaction

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Reformatsky reaction

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Knoevenagel condensation

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All of these

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Solution

The correct option is C Knoevenagel condensation
Solution:- (C) Knoevenagel condensation
In Knoevenagel-Hans condensation reaction, cinnamic acid is prepared from benzaldehyde. The reactants for this are the corresponding benzaldehyde and malonic acid in the presence of a weak base, followed by acid hydrolysis.

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Benzaldehyde cannot be prepared by:

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