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(A) The starting material is a halohydrin,specifically $2$-chlorocyclohexanol,where the $-OH$ and $-Cl$ groups are in a trans configuration.When treat

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$A$ cyclic ether (epoxide)

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(A) The starting material is a halohydrin,specifically $2$-chlorocyclohexanol,where the $-OH$ and $-Cl$ groups are in a trans configuration.When treated with a base like $NaOH$,the hydroxide ion deprotonates the hydroxyl group to form an alkoxide ion.This alkoxide ion then performs an intramolecular $S_N2$ displacement of the chloride ion from the adjacent carbon.Because the $-OH$ and $-Cl$ groups are trans to each other,they are in the anti-periplanar geometry required for the $S_N2$ reaction to occur.This results in the formation of an epoxide (cyclohexene oxide) as the product $[X]$.

In the given reaction,$[X]$ is:

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