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(C) Tollen's reagent is an oxidizing agent that reacts with aldehydes to form a silver mirror.Compounds that exist in equilibrium with an open-chain a

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$C$

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(C) Tollen's reagent is an oxidizing agent that reacts with aldehydes to form a silver mirror.Compounds that exist in equilibrium with an open-chain aldehyde form will give a positive Tollen's test.Hemiacetals are in equilibrium with their open-chain aldehyde form in the presence of a base (present in Tollen's reagent).Compound $C$ is a cyclic hemiacetal, which can open to form an aldehyde, thus giving a positive Tollen's test.Compounds $A$ and $B$ are acetals (ethers), which do not open to form aldehydes under these conditions.Compound $D$ is a cyclic alcohol, which does not contain the hemiacetal functional group required to form an aldehyde.Therefore, the correct compound is $C$.

$A$ student is given one compound among the following compounds that gives a positive test with Tollen's reagent. The compound is:

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