Question

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

• A. Perkin reaction
• B. Reformatsky reaction
• C. Knoevenagel condensation
• D. All of these

Answer 1

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.