First slide

Fructose

Question

Statement I ; Fructose is a reducing sugar
Statement II ; Fructose is a ketose

Moderate

A

Statements I and II are correct
B

Statement I is correct and statement II is incorrect
C

Statement I is incorrect and statement II is correct
D

Statements I and II are incorrect

Solution

Though fructose is a ketose it gives positive Tollen's,Fehling's and Benedict's test;
All these reagents oxidise aldehydes to carboxylic acids in alkaline medium;
In alkaline medium,fructose undergoes reversible isomerisation(Lobry-debruyn-vanekenstein rearrangement) to give an equilibrium mixture of glucose,fructose and mannose;
Thus fructose reduces Tollen's,Fehling's and Benedict's reagents;

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App