Question:
Which one of the following is not a monosaccharide?
Which one of the following is not a monosaccharide?
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Monosaccharides are single sugar molecules, whereas disaccharides are made of two monosaccharide units.
Updated On: Jul 2, 2026
- Glucose
- Fructose
- Rhamnose
- Maltose
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The Correct Option is D
Approach Solution - 1
Monosaccharides are the simplest form of carbohydrates consisting of single sugar units like glucose, fructose, and rhamnose. Maltose, on the other hand, is a disaccharide made up of two glucose units joined by a glycosidic bond.
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Approach Solution -2
Structural test: A monosaccharide cannot be broken down into simpler sugars by hydrolysis, it is a single sugar unit with the general formula \( \text{C}_n\text{H}_{2n}\text{O}_n \).
Glucose (\( \text{C}_6\text{H}_{12}\text{O}_6 \)), fructose (\( \text{C}_6\text{H}_{12}\text{O}_6 \)), and rhamnose (a deoxy hexose sugar) each satisfy this criterion, they are single-ring sugars.
Maltose, in contrast, yields two glucose molecules on hydrolysis because it is built from two glucose units joined by an \( \alpha \)-1,4 glycosidic bond, so it fails the single-unit test and is classified as a disaccharide, not a monosaccharide.
Glucose (\( \text{C}_6\text{H}_{12}\text{O}_6 \)), fructose (\( \text{C}_6\text{H}_{12}\text{O}_6 \)), and rhamnose (a deoxy hexose sugar) each satisfy this criterion, they are single-ring sugars.
Maltose, in contrast, yields two glucose molecules on hydrolysis because it is built from two glucose units joined by an \( \alpha \)-1,4 glycosidic bond, so it fails the single-unit test and is classified as a disaccharide, not a monosaccharide.
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