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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The functional group that defines a sugar as a reducing agent in reactions like Benedict’s test is a free

A. Phosphate group attached to C-6
B. Amino group on C-2
C. Aldehyde or ketone group capable of being oxidized
✓
D. Methyl group on C-6 of the pyranose ring

📝 Explanation

A reducing sugar has a free anomeric carbon whose carbonyl group can be oxidized, thereby reducing another agent like Cu²⁺ in Benedict's reagent. The free aldehyde or α-hydroxyketone group is essential for this property. Non-reducing sugars lack this free group.

📖 Additional Information

  • Phosphate group attached to C-6
  • Amino group on C-2
  • Aldehyde or ketone group capable of being oxidized
  • Methyl group on C-6 of the pyranose ring

A reducing sugar has a free anomeric carbon whose carbonyl group can be oxidized, thereby reducing another agent like Cu²⁺ in Benedict's reagent. The free aldehyde or α-hydroxyketone group is essential for this property. Non-reducing sugars lack this free group.

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