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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Biomolecules
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The pair of compounds in which both the compound shows positivities with Tollens reagent is

$\begin {array} {1 1} (A)\;\text{glucose and sucrose} & \quad (B)\;\text{fructose and sucrose} \\ (C)\;\text{acetophenone and hexanal} & \quad (D)\;\text{glucose and fructose } \end {array}$

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$CH_2OH(CHOH)_4CHO(aq) + 2Ag(NH3)_2^+(aq) + 3OH^- (aq) \rightarrow$
(Glucose) (Tollen's Reagent, Ammoniacal Silver Nitrate) Only aldehydes give a positive Tollens test. However, under the strongly basic conditions of the test, alpha-hydroxy ketones can isomerize to aldehydes, so they will also give a positive Tollens test. Fructose is an alpha-hydroxy ketone
Ans : (D)
answered Mar 30, 2014 by thanvigandhi_1
 

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