Question

Cellulose does not form blue colour with iodine because

• A. It is a helical molecule
• B. It does not contain complex helices and hence cannot hold iodine molecules
• C. It breaks down when iodine reacts with it
• D. It is a disaccharide

Answer 1

Answer: (B)

It does not contain complex helices and hence cannot hold iodine molecules

Answer 2

Cellulose is a linear polymer of glucose molecules, and it does not form the complex helical structure that starch does. The blue color with iodine is a result of the iodine molecules getting trapped within the helical structure of starch, creating a specific complex. Cellulose lacks this helical arrangement, so it does not produce the blue color with iodine.

Therefore, The correct option is (B): It does not contain complex helices and hence cannot hold iodine molecules.