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Both glucose and fructose are reducing s...

Both glucose and fructose are reducing sugars but sucrose is non reducing in nature. Why?

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In the formation of sucrose (disaccharide), both glucose and frutose molecules are linked to each other at their aldehydic and ketonic groups respectively. Since these are not free in sucrose, it is a non-reducing sugar. This is further confirmed by the structure of sucrose.
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