The addition of an acid and heat to 2-oxocyclopentanecarboxylic acid yields a:

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Correct Answer:C. cyclopentanone
Beta-keto carboxylic acids undergo decarboxylation through ring formations. The carbonyl bond of the ketone will react with the alcohol group of the carboxylic acid to form a ring and release the carboxylic acid as CO2. The remaining enol will tautomerize into a carbonyl group again, leaving cyclopentanone.
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