Question

Which carbohydrate gives red color when iodine solution is added to it
A) Starch
B) Glycogen
C) Dextrin
D) Insulin

Answer 1

Hint:Carbohydrate is formed from the word carbon and hydrogen. It is formed by the combination of the chemical elements carbon, hydrogen, and oxygen. Carbohydrates are the most abundant organic compound found in nature.

Complete step by step answer:A) Starch- Starch is a carbohydrate and is mostly found in plants in seeds and tubers, in the form of granules. They serve as a storehouse for carbohydrates. It consists of two different types of polysaccharides that are made up of glucose units. When an iodine solution is added to start it gives the blue solution.
B) Glycogen- Glycogen is a carbohydrate and is structurally similar to amylopectin. Glycogen is highly branched (with eight to twelve glucose units between branches) as compared to amylopectin but when treated with iodine solution agent or reddish-brown color.
C) Dextrin - Dextrin is a glucose Polysaccharide. A variety of products is obtained when starch is added in the presence of a small amount of moisture and acid. It is used as an adhesive on stamps because of their stickiness and wetting characteristics. Dextrin is easily digested than starch so it is used largely in the commercial preparation of infant foods. Dextrin when treated with iodine solution gives a reddish-brown color.
D) Insulin- Insulin testing may be done with glucose and C peptide test.
Thus the option B is the correct answer.

Note:Glycogen act as the energy reverse carbohydrate of animals. About 70% of total glycogen is sorted in the muscle cells of the body. By acid hydrolysis, glycogen can be broken down into its D-glucose subunits.