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(C) The starting material $(P)$ is $2$-oxocyclohexanecarboxylic acid. Heating $(P)$ causes decarboxylation,where the $-COOH$ group is lost as $CO_2$,r

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Cyclohexane

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(C) The starting material $(P)$ is $2$-oxocyclohexanecarboxylic acid. Heating $(P)$ causes decarboxylation,where the $-COOH$ group is lost as $CO_2$,resulting in the formation of cyclohexanone as intermediate $X$. The subsequent reaction with $Zn-Hg/HCl$ is a Clemmensen reduction,which reduces the carbonyl group $(C=O)$ of cyclohexanone to a methylene group $(CH_2)$. Therefore,the final product $Y$ is cyclohexane.

The compound $(P)$ undergoes the following reaction sequence: $(P)$ $\xrightarrow{\Delta} X$ $\xrightarrow{Zn-Hg/HCl} Y$. Identify $Y$.

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