The following carbohydrate tests have been performed on a sample containing an unknown sugar.

The results obtained are indicated as a positive (+) or negative (-) reaction for each of the tests performed.



Fehling

Benedict

Barfoed

Bial

Iodine

Seliwanoff

Unknown Sugar

+

+

+

-

-

+


Based on the carbohydrate test results obtained for unknown sugar, identify the unknown sugar:



Xylose


Glucose


Fructose


Sucrose


Maltose


Starch