JEE Main Chemistry question
How many of the following reagents/tests can be used to distinguish between glucose and fructose? (a) Bromine water (b) Fehling's solution (c) Tollens' reagent (d) Phenylhydrazine (e) Seliwanoff's test
Answer: 2
Solution
Fehling's solution, Tollens' reagent and phenylhydrazine all give a positive result with both glucose and fructose (both being reducing sugars that form osazones), so they do not distinguish between the two. Bromine water oxidises the aldehyde of glucose
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