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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In the context of stereochemistry, the D or L configuration of a monosaccharide is determined by the orientation of the hydroxyl group on the

A. Anomeric carbon (C-1) in its ring form
B. Penultimate (farthest chiral) carbon from the carbonyl group
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C. Carbonyl carbon (C-1 or C-2)
D. Carbon bearing the free amino group

📝 Explanation

The D/L classification is based on the configuration of the chiral carbon farthest from the most oxidized end (the carbonyl group). If the -OH on this carbon is on the right in a Fischer projection, it is D; if on the left, it is L. For glucose, this is C-5.

📖 Additional Information

  • Anomeric carbon (C-1) in its ring form
  • Penultimate (farthest chiral) carbon from the carbonyl group
  • Carbonyl carbon (C-1 or C-2)
  • Carbon bearing the free amino group

The D/L classification is based on the configuration of the chiral carbon farthest from the most oxidized end (the carbonyl group). If the -OH on this carbon is on the right in a Fischer projection, it is D; if on the left, it is L. For glucose, this is C-5.

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