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

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is
  1. A protein
  2. A monosaccharide
  3. A lipid
  4. An amino acid

Solution

Protein gives blue-violet color with ninhydrin (2,2-dihydroxyindane-1,3-dione)
Carbohydrates gives brown red ppt.with benedict's solution (Alk. $\mathrm{CuSO}_{4}$ +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. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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