Cellulose does not form blue colour with Iodine because
It is a disaccharide
It is a helical molecule
It does not contain complex helices and hence cannot hold iodine molecules
It breaks down when iodine reacts with it
Iodine forms a blue-black complex with starch because starch contains helical structures that can trap iodine molecules. Cellulose is a linear polymer of glucose and does not form these complex helices, so it cannot hold iodine molecules to produce the blue color.
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