From the following compounds how many can give positive Fehling's testA) AcetoneB) BenzaldehydeC) FructoseD) Formic acid

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A, D only

B, C, D only

C, D only

B only

answer is C.

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Detailed Solution

Acetone …ketone..cannot give positive Fehling's testBenzaldehye…aromatic aldehyde…cannot give positive Fehling's testFructose…monosaccharide…can give positive Fehling's testFormicacid…contains -CHO group…can give positive Fehling's testFructose 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 -CO||-H group and gives positive Fehling's test.

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