Which reagent can be used to distinguish D-glucose from D-fructose?

AFehling solution
BTollens reagent
CExcess phenylhydrazine
DBromine water

Answer: D

Both sugars reduce Fehling and Tollens reagents (fructose through enediol isomerisation) and give the same osazone. Bromine water oxidises the aldehyde group of glucose to gluconic acid but does not oxidise fructose.

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