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Reducing sugar can reduce:

1. Aldehydes to alcohols
2. Ferric salts to ferrous salts
3. Chlorates to chlorides
4. Fehling solution to cuprous oxide

Correct answer: Fehling solution to cuprous oxide

Solution

Reducing sugars have a free anomeric carbon that can act as a reducing agent. In Fehling’s solution, they reduce blue Cu2+ ions to red cuprous oxide (Cu2O).

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