Multiple Choice
Which of the following disaccharides are reducing sugars?
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9. Carbohydrates
Reducing Sugars
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Which of the following is NOT a reducing sugar?
A
Sucrose
B
Glucose
C
Maltose
D
Lactose
Verified step by step guidance1
Understand the concept of reducing sugars: Reducing sugars are carbohydrates that have a free aldehyde (-CHO) or ketone (-C=O) group, which can reduce other molecules, such as Benedict's reagent. Common examples include glucose, maltose, and lactose.
Examine the structure of sucrose: Sucrose is a disaccharide composed of glucose and fructose linked by a glycosidic bond. This bond involves the anomeric carbons of both monosaccharides, effectively locking the aldehyde and ketone groups and preventing them from participating in reduction reactions.
Compare sucrose to other options: Glucose, maltose, and lactose all have free aldehyde or ketone groups in their structures, making them reducing sugars. Sucrose, due to its glycosidic bond, does not have a free reducing group and is therefore not a reducing sugar.
Apply the definition to identify the correct answer: Based on the structural analysis, sucrose does not meet the criteria for a reducing sugar, while glucose, maltose, and lactose do.
Conclude that sucrose is the correct answer to the question, as it is the only option that is NOT a reducing sugar.
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