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Nucleophilic Substitution Reaction

For the given...

Question

For the given reaction, supply a carboxylic acid as the starting material that would yield the indicated product under the given conditions.
Find the structure of A?

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Solution

After heating the beta keto acids, remove the acid part as $C O_{2}$ gas.
$β$ -keto acid means the $C O O H$ group is at next position to ketone group.

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Nucleophilic Substitution Reaction

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