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Give scientific reasons :The disaccharide sucrose gives negative Tollens test while the disaccharide maltose gives positive Tollens test. |
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Answer» (1) In disaccharide sucrose, the reducing groups of glucose and fructose are involved in glycosidic bond formation, sucrose is a nonreducing sugar. As there is no free aldehyde group, it does not reduce Tollen’s reagent to metallic silver. Hence, sucrose gives negative Tollen’s test. (2) While the disaccharide maltose is a reducing sugar because a free aldehyde group can be produced at C of second sugar molecule. It is a reducing sugar. It reduces Tollen’s reagent to shining silver mirror. Hence, Maltose gives positive Tollen’s test. |
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