Which of the following hydroxy ethers gives a | vedclass

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(B) The correct answer is $(b)$.$2$-methyl-$2$-hydroxytetrahydropyran is a cyclic hemiacetal.Hemiacetals are in equilibrium with their corresponding a

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$2-$methyl$-2-$hydroxytetrahydropyran

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(B) The correct answer is $(b)$.$2$-methyl-$2$-hydroxytetrahydropyran is a cyclic hemiacetal.Hemiacetals are in equilibrium with their corresponding aldehydes (or ketones) in aqueous solution.Since aldehydes reduce Tollen's reagent to metallic silver,cyclic hemiacetals that can open to form an aldehyde group will give a positive Tollen's test.In the case of $2$-methyl-$2$-hydroxytetrahydropyran,the ring opens to form a hydroxy-ketone,but hemiacetals derived from aldehydes (like $CH_3-CH(OH)-OCH_3$) are more commonly cited for this test. However,among the given options,the structure in $(b)$ represents a hemiacetal functional group which is in equilibrium with the open-chain form containing a carbonyl group,allowing it to react with Tollen's reagent.

Which of the following hydroxy ethers gives a $+ve$ test with Tollen's reagent?

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