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Question

Assertion :Sucrose is a non reducing sugar. Reason: Sucrose is a disaccharide formed by glycosidic linkage between C1 of α glucose and C2 of β fructose.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sucrose is made up of two monosaccharides: glucose and fructose.
These two monosaccharides are held together by a glycosidic linkage between C1 of glucose and C2 of fructose.
Since the reducing groups of glucose and fructose (i.e the free aldehyde/ketone groups) are involved in the glycosidic bond formation and are not available, sucrose is a non-reducing sugar.
Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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