Question

Seliwanoff test and Xanthoproteic test are used for the identification of ______ and ______ respectively.

Options

• ketoses, aldoses

• proteins, ketoses

• ketoses, proteins

• aldoses, ketoses

Answer 1

Seliwanoff test and Xanthoproteic test are used for the identification of ketoses and proteins respectively.

Explanation:

Seliwanoff test is used to distinguish ketoses from aldoses. The reagent of this test consists of resorcinol and cone. HCl. On treatment with a concentrated acid, ketones are dehydrated more rapidly to give furfural derivative and on condensation with resorcinol give cherry red complex. 

Xanthoproteic test is used to detect amino aci ds containing aromatic nucleus. On heating with cone. HNO3 it gives yellow colour's nitro derivatives.