Question

Conversion of benzaldehyde to 3-phenyl-prop-2-en-1-oic acid is:

• A. Perkin condensation
• B. Claisen condensation
• C. Oxidative addition
• D. Aldol condensation

Answer 1

Answer: (A)

Perkin condensation

Answer 2

(i) Benzaldehyde does not undergo aldol condensation as it does not have a-hydrogen atom.
(ii) Perkin condensation
$\underset{\text{benzaldehyde}}{\mathop{{{C}_{6}}{{H}_{5}}CHO}}\,\,+\,\underset{\text{acetic}\,\text{anhydride}}{\mathop{{{(C{{H}_{3}}CO)}_{2}}O}}\,\xrightarrow[-{{H}_{2}}O,\Delta ]{C{{H}_{3}}COONa}$
$\underset{3-\text{phenyl}\,\text{prop}\,2-\text{en}\,-1\,\text{oic}\,\text{acid}}{\mathop{{{C}_{6}}{{H}_{5}}CH=CHCOOH+C{{H}_{3}}COOH}}\,$