Question:
Which of the following pair of monosaccharides contains epimers of each other?
Which of the following pair of monosaccharides contains epimers of each other?
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Epimers differ at a single chiral center (not the anomeric carbon). Remember: D-Mannose and D-Glucose differ at C-2 — making them classic epimers.
Updated On: Apr 17, 2025
- D-Mannose and D-Glucose
- D-Gulose and D-Glucose
- D-Arabinose and L-Arabinose
- D-Glucose and D-Fructose
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The Correct Option is A
Solution and Explanation
Step 1: Define epimers.
Epimers are isomers of monosaccharides that differ in configuration at only one specific chiral carbon atom, other than the anomeric carbon. Step 2: Analyze the options.
D-Mannose and D-Glucose differ at C-2 — they are C-2 epimers.
D-Gulose and D-Glucose differ at more than one chiral center.
D-Arabinose and L-Arabinose are enantiomers, not epimers.
D-Glucose and D-Fructose are structural isomers (aldose vs ketose), not epimers.
Conclusion:
Only D-Mannose and D-Glucose qualify as epimers, differing only at the second carbon.
Epimers are isomers of monosaccharides that differ in configuration at only one specific chiral carbon atom, other than the anomeric carbon. Step 2: Analyze the options.
D-Mannose and D-Glucose differ at C-2 — they are C-2 epimers.
D-Gulose and D-Glucose differ at more than one chiral center.
D-Arabinose and L-Arabinose are enantiomers, not epimers.
D-Glucose and D-Fructose are structural isomers (aldose vs ketose), not epimers.
Conclusion:
Only D-Mannose and D-Glucose qualify as epimers, differing only at the second carbon.
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