can anyone give me reason why sucrose is non reducing whereas maltose and lactose are reducing

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Solution

As in sucrose - aldehydic carbon of glucose and ketonic carbon of fructose are bounded to each other and forms glycosidic bond . Hence non reducing .whereas in maltose one of the aldehydic carbon is free . Same with lactose .

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The correct statements among the following are

A) The minimum number of carbon atoms present in a monosaccharide is 6

B) Among glucose, Lactose, Maltose and Sucrose,non reducing sugar is sucrose

C) In amylopectin of starch, branched chain are due to 1,4 - linkages

D) In cellulose, β - D - glucose units are joined by 1,4 - glycosidic linkages

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