Cellulose does not form blue colour with iodine because
It breaks down when iodine reacts with it.
It is a disaccharide.
It is a helical molecule.
It does not contain complex helices and hence cannot hold iodine molecules.
According to the text, starch forms helical secondary structures that can hold I2 (iodine) molecules in the helical portion, resulting in a blue colour. In contrast, 'Cellulose does not contain complex helices and hence cannot hold I2' .
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