Identify sugar which doesn't give silver mirror test with Tollen's reagent $(A g N O_{3} + N H_{4} O H)$ ?

Fructose

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Maltose

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Lactose

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Sucrose

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Solution

The correct option is D Sucrose
Carbohydrates having free aldehyde group or free ketone group or comprising hemiacetal form in the structure are reducing in nature. They gives positive test with tollens' reacgent.

Anomeric carbons of both the monosaccharides of sucrose are involved in glycosidic linkage. So, its chemical structure does not allow the formation of hemiacteal.

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Table 1

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Identify sugar which doesn't give silver mirror test with Tollen's reagent (AgNO3+NH4OH)?

Identify sugar which doesn't give silver mirror test with Tollen's reagent $(A g N O_{3} + N H_{4} O H)$ ?