JEE Main20209 Jan 2020Evening ShiftChemistryBiomoleculesActual
A , B and C are three biomolecules. The results of the tests performed on them are given below: Molisch's test Barfoed Test Biuret Test A Positive Negative Negative B Positive Positive Negative C Negative Negative Positive A , B and C are respectively:
Options
- AA = Glucose, B = Fructose C = Albumin
- BA = Lactose, B = Glucose, C = Albumin
- CA = Lactose, B = Glucose, C = Alanine
- DA = Lactose, B = Fructose, C = Alanine
Correct answer
B. A = Lactose, B = Glucose, C = Albumin
Step-by-step solution
Alanine does not show Biuret test because Biuret test is used for deduction of peptide linkage & alanine is amino acid. Albumine is protein so have paptide linkage so it gives positive Biuret test. Positive Barfoed test is shown by monosaccharide but not disaccharide. Positive Molisch's test is shown by glucose.