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Fructose and glucose can be distinguished by -

1. (1) Fehling's test
2. (2) Seliwanoff's test
3. (3) Barfoed's test
4. (4) Benedict's test

Correct answer: (2) Seliwanoff's test

Solution

Seliwanoff's test gives a fast cherry-red color with ketoses like fructose but is slow/negative with aldoses like glucose. Fehling's, Benedict's, and Barfoed's react with both, so they cannot distinguish them.

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