Which of the following is not a test for amino acids?: (A) Biuret test, (B) Xanthoproteic reaction, (C) Ninhydrin test, (D) Molisch's test
Answer is D. Biuret test, ninhydrin test, and xanthoproteic test are tests of proteins. Molisch test is that for carbohydrates.Ref: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 80