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Question

Which carbohydrate gives red colour when iodine solution is added to it?
Starch
Glycogen
Dextrin
Insulin

A

Glycogen

B

Dextrin

C

Starch

D

Insulin

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Solution

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Iodine test is used to distinguish between the presence of starch and glycogen and other saccharides.
When starch solution is treated with iodine, it gives a blue color. The blue color develops because of the trapping of iodine in the helical coils of amylose. When this test solution is heated, the color disappears due to disruption of the helical coils of amylose and the color reappears upon cooling, due to the reformation of helical coils. Glycogen however gives red color with iodine.
Therefore, the correct answer is option B.

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