A certain compound gives a negative test with ninhydrin and positive test with Benedict's solution. The compound is:
Protein
Monosaccharide
Lipid
An amino acid
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.
Therefore, (2) option is correct.