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Question

Which of these is a disaccharide?

A
Sucrose
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B
Glucose
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C
Fructose
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D
Galactose
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Solution

The correct option is D Sucrose
Sucrose is a disaccharide formed by the glycosidic linkage between glucose and fructose. The bond is formed between the between C1 on the glucosyl subunit and C2 on the fructose unit. It has no free aldehyde or keto group so they are known as non- reducing sugar. The anomeric carbon of glucose and fructose forms the glycosidic bonds.
So, the correct answer is option B.

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