Q. Cellulose does not form blue colour with Iodine because
A) It breakes down when iodine reacts with it.
B) It is a disaccharide.
C) It is a helical molecule.
D) It does not contain complex helices and hence cannot hold iodine molecules.
Explanation
[Solution from source] Starch forms helical secondary structures that hold $I_2$ (blue colour); cellulose is linear with no complex helices and cannot hold $I_2$. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.