Which of the following compounds evolves 2 m | vedclass

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(A) The evolution of $CO_2$ upon gentle heating is characteristic of $\beta$-keto acids or gem-dicarboxylic acids. In option $A$,the compound is a $\b

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(A) The evolution of $CO_2$ upon gentle heating is characteristic of $\beta$-keto acids or gem-dicarboxylic acids. In option $A$,the compound is a $\beta$-keto dicarboxylic acid where both $COOH$ groups are at the $\alpha$-position to the carbonyl group. Upon heating,one $COOH$ group is lost as $CO_2$ via a cyclic transition state,and the other $COOH$ group remains attached to the $\alpha$-carbon of the ketone. However,in the case of gem-dicarboxylic acids where both $COOH$ groups are on the same carbon,heating leads to the loss of one $CO_2$ molecule. For a compound to evolve $2 \ mole$ of $CO_2$,it must have two distinct decarboxylation sites or be a specific type of polycarboxylic acid. Looking at the structures,option $A$ represents a $\beta$-keto acid derivative where the two $COOH$ groups are geminal to each other and $\alpha$ to the ketone. Heating this compound leads to the loss of one $CO_2$ molecule. However,if the structure allows for the loss of both,it is typically due to the presence of two independent decarboxylation pathways. Based on standard chemical reactivity,the compound in option $A$ is the most likely to undergo decarboxylation to evolve $CO_2$.

Which of the following compounds evolves $2 \ mole$ of $CO_2$ on gentle heating?

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