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Standard XII

Chemistry

Oxides of Nitrogen

A certain com...

Question

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is:

a protein

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a monosaccharide

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a lipid

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an amino acid

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Solution

The correct option is B a monosaccharide
Protein gives blue-violet color with ninhydrin (2,2-dihydroxyindane-1,3-dione)
Carbohydrates gives brown red ppt.with benedict's solution (Alk. $C u S O_{4}$ +Citrate ions)

A compound which gives a negative test with ninhydrin, it cannot be a protein or an amino acid. As, it gives a positive test with Benedict's solution. So, it must be a monosaccharide but not a lipid.

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