Answer: Cinnamic acid.
- A Cinnamic acid
- B Salicylic acid
- C Benzoic acid
- D Benzyl alcohol
Correct answer: A. Cinnamic acid
Explanation: Perkin reaction between benzaldehyde and acetic anhydride gives cinnamic acid.
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Concept context
Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
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