Is fructose positive in Fehling’s test?


Fructose is a reducing sugar, which means it has the ability to reduce certain chemical reagents, such as Fehling’s solution. Fehling’s test is commonly used to detect the presence of reducing sugars, including fructose.

When fructose reacts with Fehling’s solution, it undergoes oxidation. The copper(II) ions (Cu2+) in Fehling’s solution are reduced to copper(I) oxide (Cu2O), which forms a brick-red precipitate. This indicates a positive result for the presence of fructose or other reducing sugars.

In summary, fructose is indeed positive in Fehling’s test.

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