Ferric chloride test is used to diagnose:: (A) Phenylketonuria, (B) Alkaptonuria, (C) Hartnup disease, (D) Cystinuria
Answer is A. a. Pheylketonuria(Ref: Nelson's 20/e p 636-642; Ghai 8/e p 653-655)Ferric chloride test is used to determine the presence or absence of phenols in a given sample.FeCl3 test with urine gives green colour in Phenylketonuria (detects phenylalanine in urine).