Why does fructose reduce Fehling's solution?

  • Thread starter Hysteria X
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In summary, fructose reduces Fehling's solution because it is a reducing sugar that has the ability to donate electrons to other molecules. It does so by breaking down into smaller molecules, such as glucose and mannose, which react with the copper ions in Fehling's solution and cause them to be reduced and form a precipitate. Fructose is not the only sugar that can reduce Fehling's solution; other reducing sugars like glucose, lactose, and maltose also have this ability. Fehling's solution is used specifically to test for fructose because it tests for reducing sugars, and fructose is a reducing sugar. Fructose can reduce Fehling's solution in any concentration, though the rate of reduction may
  • #1
Hysteria X
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is it because of the keto group it has? what generally reduces fehlings solution and tollens reagent??
 
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  • #2
You must know which group in organic analysis uses Tollen's and Fehling's solution as confirmatory test.

Actually, fructose in aqueous solution is not just fructose. It changes its form, being under kinetic equilibrium with its other forms (try to guess), which in turn are responsible for those confirmatory tests.
 

Related to Why does fructose reduce Fehling's solution?

1. Why does fructose reduce Fehling's solution?

Fructose reduces Fehling's solution because it is a reducing sugar. This means that it has the ability to donate electrons to another molecule, which is a key characteristic of reducing agents.

2. How does fructose reduce Fehling's solution?

Fructose reduces Fehling's solution by breaking down into smaller molecules, including glucose and mannose. These smaller molecules are then able to react with the copper ions in Fehling's solution, causing them to be reduced and form a precipitate.

3. Is fructose the only sugar that can reduce Fehling's solution?

No, fructose is not the only sugar that can reduce Fehling's solution. Other reducing sugars such as glucose, lactose, and maltose also have the ability to reduce Fehling's solution.

4. Why is Fehling's solution used to test for fructose?

Fehling's solution is used to test for fructose because it specifically tests for reducing sugars. Fructose is a reducing sugar and will therefore cause a positive reaction with Fehling's solution, indicating its presence.

5. Can fructose reduce Fehling's solution in any concentration?

Yes, fructose can reduce Fehling's solution in any concentration. However, the rate of reduction may vary depending on the concentration of fructose present. Higher concentrations of fructose may reduce Fehling's solution faster, while lower concentrations may take longer to show a positive reaction.

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