JEE MAIN - Chemistry (2010 - No. 10)

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.