Question:
Which of the following is an aldosugar?
Which of the following is an aldosugar?
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Aldose has an aldehyde at C1; the -ulose sugars and fructose are ketoses.
Updated On: Jun 24, 2026
- Fructose
- Erythrulose
- Glucose
- None
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The Correct Option is C
Solution and Explanation
Step 1: Monosaccharides are classified by their carbonyl group. An aldose carries an aldehyde group (-CHO) at carbon 1, whereas a ketose carries a ketone group (C=O) at carbon 2.
Step 2: Glucose is the classic aldohexose, having an aldehyde group at C1. So it is an aldosugar.
Step 3: Why the others are wrong. Fructose is a ketohexose (ketose), and erythrulose is a ketotetrose (ketose). Neither carries an aldehyde group, so option d (None) is also incorrect.
Step 4: Quick recall of aldoses vs ketoses: aldoses include glyceraldehyde, erythrose, ribose, xylose, glucose, galactose and mannose; ketoses include dihydroxyacetone, erythrulose, ribulose, xylulose and fructose. Hence the answer is Glucose.
Step 2: Glucose is the classic aldohexose, having an aldehyde group at C1. So it is an aldosugar.
Step 3: Why the others are wrong. Fructose is a ketohexose (ketose), and erythrulose is a ketotetrose (ketose). Neither carries an aldehyde group, so option d (None) is also incorrect.
Step 4: Quick recall of aldoses vs ketoses: aldoses include glyceraldehyde, erythrose, ribose, xylose, glucose, galactose and mannose; ketoses include dihydroxyacetone, erythrulose, ribulose, xylulose and fructose. Hence the answer is Glucose.
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