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The two ring-form structures of glucose that differ only in the spatial arrangement of the hydroxyl group at the anomeric carbon (C-1) — one being alpha-D-(+)-glucose and the other beta-D-(+)-glucose — are best described as which type of isomers?
- Enantiomers
- Anomers
- Constitutional isomers
- Identical molecules
Correct answer: Anomers
Solution
Alpha-D-(+)-glucose and beta-D-(+)-glucose differ only in the configuration at C-1 (the anomeric carbon), making them anomers — a special subset of diastereomers arising from ring-chain tautomerism in carbohydrates.
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