JEE Main Chemistry question

Iodine test is shown by

(A)Glucose
(B)StarchCorrect
(C)Glycogen
(D)Polypeptide

Answer: (B)

Solution

Starch forms a deep blue-black colour with iodine because iodine molecules get trapped inside the helical amylose coil; the colour disappears on heating and reappears on cooling.

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Question ID VK-150569