Structure of A is | vedclass

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(C) The reaction sequence is as follows:$1$. The starting material $(A)$ is a ketone,specifically spiro[$5.4$]decan$-1-$one.$2$. Treatment with $LiAlH

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(C) The reaction sequence is as follows:$1$. The starting material $(A)$ is a ketone,specifically spiro[$5.4$]decan$-1-$one.$2$. Treatment with $LiAlH_4$ reduces the ketone group to a secondary alcohol,forming spiro[$5.4$]decan$-1-$ol $(B)$.$3$. Subsequent treatment with $H^{\oplus}$ and heat causes acid-catalyzed dehydration of the alcohol to form the alkene,which is octahydronaphthalene (or a related bicyclic alkene structure depending on the rearrangement).$4$. Based on the provided options and the final product structure,$(A)$ is spiro[$5.4$]decan$-1-$one.

Structure of $A$ is

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