Which of the following beta-keto carboxylic a | vedclass

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(A) Decarboxylation of $\beta$-keto acids typically proceeds through a cyclic six-membered transition state,which requires the formation of an enol in

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(A) Decarboxylation of $\beta$-keto acids typically proceeds through a cyclic six-membered transition state,which requires the formation of an enol intermediate. This mechanism is governed by Bredt's rule in bicyclic systems. According to Bredt's rule,a double bond cannot be placed at the bridgehead of a bridged bicyclic system unless the rings are large enough. In option $A$,the carboxyl group is at the bridgehead position. Decarboxylation would require the formation of an enol with a double bond at the bridgehead. Since this violates Bredt's rule,the transition state is highly unstable or impossible to form,preventing decarboxylation. Therefore,the compound in option $A$ does not undergo decarboxylation.

Which of the following $\beta$-keto carboxylic acids does not undergo decarboxylation on heating?

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