Question

Study the given statements and select the correct answer,
(i) Cellulose is a homopolymer of glucose.
(ii) Inulin is a homopolymer of fructose.
(iii) Starch gives blue colour and glycogen gives red colour with iodine solution.
(iv) Cellulose gives no colour with iodine solution.

• A. Statements (i), (ii) and (iii) are correct
• B. Statements (i), (ii) and (iv) are correct
• C. Statements (ii) and (iii) are correct
• D. All statements are correct

Answer 1

Answer: (D)

Starch can hold $l_2$ (iodine) molecules in the helical portion. The starch-$l_2$ is blue in colour. Cellulose does not contain complex helices and hence cannot hold $l_2$ and hence remain colourless.