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Which one of the following is a non-reducing carbohydrate?

1. Maltose
2. Sucrose
3. Lactose
4. Ribose 5-phosphate

Correct answer: Sucrose

Solution

Sucrose is non-reducing because its glycosidic linkage joins the anomeric carbon of glucose to the anomeric carbon of fructose, leaving no free hemiacetal/hemiketal group. Maltose and lactose each retain one free anomeric carbon, so they are reducing sugars.

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