First slide

Fructose

Question

From the following compounds how many can give positive Fehling's test
A) Acetone
B) Benzaldehyde
C) Fructose
D) Formic acid

Moderate

A

A, D only
B

B, C, D only
C

C, D only
D

B only

Solution

Acetone …ketone..cannot give positive Fehling's test
Benzaldehye…aromatic aldehyde…cannot give positive Fehling's test
Fructose…monosaccharide…can give positive Fehling's test
Formicacid…contains -CHO group…can give positive Fehling's test
Fructose even though ketone undergoes reversible isomerisation in alkaline medium to form a mixture of glucose, fructose and mannose. Thus it gives positive Fehling's test.
Formic acid contains $- \overset{\underset{| |}{O}}{C} - H$ group and gives positive Fehling's test.

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