Question

Which of the following compounds can be detected by Molisch's test :

• A. Nitro compounds
• B. Sugars
• C. Amines
• D. Primary alcohols

Answer 1

Answer: (B)

Sugars

Answer 2

This is a general test for carbohydrates. One or two drops of alcoholic solution of $\alpha$-naphthol is added to 2 ml glucose solution. 1 ml of conc. $H_2SO_4$ solution is added carefully along the sides of the test tube. The formation of a violet ring at the junction of two liquids confirms the presence of a carbohydrate or sugar.