QJEEM10Chf20e: JEE Main 2010 Chemistry - Class 12 JEEM10Chf20e Solution: Biuret test is not given by

Biuret test produces violet colour on addition of dilute $$CaS{O}_4$$ to alkaline solution of a compound containing perptide linkage.

Polypeptides, proteins and urea have -



(peptide) linkage while carbohydrates have glycosidic linkages. So, test of carbohydrates should be different from that of other three.