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Question
Which of the following pairs give positive Tollens test?
(IIT-JEE,2004)
Which of the following pairs give positive Tollens test?
(IIT-JEE,2004)
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Solution
The correct option is B Glucose, fructose
Glucose is an aldehyde, gives positive Tollens test. Fructose although ketone gives positive Tollens test because under the basic conditions of the reagent, fructose undergoes a rearrangement to form glucose and mannose (C-2 epimer of glucose).
Glucose is an aldehyde, gives positive Tollens test. Fructose although ketone gives positive Tollens test because under the basic conditions of the reagent, fructose undergoes a rearrangement to form glucose and mannose (C-2 epimer of glucose).
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