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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In the formation of the pyranose ring form of D-glucose, the reaction occurs between the carbonyl group on C-1 and the hydroxyl group on

A. C-2
B. C-3
C. C-4
D. C-5
✓

📝 Explanation

A six-membered ring (pyranose) forms when the carbonyl carbon (C1 in aldoses) reacts with the -OH group on C5. A five-membered ring (furanose) would involve a reaction with the -OH on C4. Glucose predominantly forms a pyranose ring.

📖 Additional Information

  • C-2
  • C-3
  • C-4
  • C-5

A six-membered ring (pyranose) forms when the carbonyl carbon (C1 in aldoses) reacts with the -OH group on C5. A five-membered ring (furanose) would involve a reaction with the -OH on C4. Glucose predominantly forms a pyranose ring.

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