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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In the formation of a furanose ring, such as that of fructose, the reaction occurs between the carbonyl group on C-2 and the hydroxyl group on

A. C-3
B. C-4
C. C-5
✓
D. C-6

📝 Explanation

A five-membered ring (furanose) forms when the keto group on C-2 of a ketose reacts with the hydroxyl group on C-5. This is the predominant ring form for fructose in solution, creating a fructofuranose structure.

📖 Additional Information

  • C-3
  • C-4
  • C-5
  • C-6

A five-membered ring (furanose) forms when the keto group on C-2 of a ketose reacts with the hydroxyl group on C-5. This is the predominant ring form for fructose in solution, creating a fructofuranose structure.

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