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  4. Which of the following reactants on reaction with cone. NaOH followed by acidification gives the following lactone as the only product?

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Q. Which of the following reactants on reaction with cone. $NaOH $ followed by acidification gives the following lactone as the only product?Chemistry Question Image

IIT JEEIIT JEE 2006Aldehydes Ketones and Carboxylic Acids

Solution:

$X$ is $\left( CH _{3} CO \right)_{2} O$ and it is an example of Perkin's reaction.