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(B) The first compound is a cyclic acetal,which is stable in basic conditions and does not react with Tollen's reagent.The second compound is a cyclic

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Tollen's reagent

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(B) The first compound is a cyclic acetal,which is stable in basic conditions and does not react with Tollen's reagent.The second compound is a cyclic hemiacetal. In the presence of the basic medium of Tollen's reagent,the hemiacetal ring opens to form an open-chain hydroxy-aldehyde $(HO-CH_2-CH_2-CH_2-CHO)$.Since the resulting molecule contains an aldehyde group,it will give a positive Tollen's test (silver mirror test).Therefore,Tollen's reagent can be used to differentiate between the two compounds.

The given compounds can be differentiated by which of the following reagents?

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