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(B) The first compound is a cyclic acetal ($2$-methoxytetrahydrofuran),which is stable in basic conditions and does not react with Tollen's reagent.Th

Vedclass · Accepted Answer

Tollen's reagent

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(B) The first compound is a cyclic acetal ($2$-methoxytetrahydrofuran),which is stable in basic conditions and does not react with Tollen's reagent.The second compound is a cyclic hemiacetal ($2$-hydroxytetrahydrofuran),which exists in equilibrium with its open-chain hydroxy-aldehyde form in aqueous solution.The open-chain hydroxy-aldehyde contains a free aldehyde group $(-CHO)$,which gives a positive Tollen's test (formation of silver mirror).Therefore,Tollen's reagent can be used to differentiate between the two.

The above compounds can be differentiated by the following reagent:

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