Which of the following disaccharides will not reduce Tollens reagent?

(IIT-JEE, 2005)

Only P

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Only Q

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Both P and Q

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None of these

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Solution

The correct option is B Only Q

(P) will reduce Tollens reagent since it has free hemiacetal linkage.

(Q) will not reduce Tollens reagents since it does not have free hemiacetal linkage; both are involved in glycosidic linkage.

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