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Question

Fructose and glucose can be distinguished by

A
Fehling’s test
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B
Barfoed’s test
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C
Benedict’s test
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D
Seliwanoff’s test
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Solution

The correct option is D Seliwanoff’s test
Both fructose and glucose give following test positive
(i) Fehling’s test (red ppt. of Cu2O is obtained).
(ii) Barfoed’s test (red ppt. of Cu2O is obtained)
(iii) Benedict’s test (red ppt. of Cu2O is obtained)
Seliwanoff’s test is used to differentiate between ketose and aldose. The reagent is a solution of resorcinol in concentrated HCl. The reagent when heated along with a sugar will produce furfural or hydroxy-methylfurfural, which further reacts to give red color. Ketose (fructose) reacts more quickly than aldose (glucose).

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