JEE Main Chemistry question

[IIT JEE 2004] Which of the following pairs give a positive Tollens' test?

(A)Glucose, sucrose
(B)Glucose, fructoseCorrect
(C)Hexanal, acetophenone
(D)Fructose, sucrose

Answer: (B)

Solution

Tollens' reagent is reduced by aldehydes and by α-hydroxy ketones; glucose (an aldose) and fructose (an α-hydroxy ketone that isomerises to an aldose under basic conditions) both give a positive silver-mirror test. Sucrose

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Question ID VK-150584