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- #National Eligibility Cum Entrance Test - 2023
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Cellulose does not form blue colour with Iodine because
It is a disaccharide.
It is a helical molecules
It does not contain complex helices and hence cannot hold iodine molecules.
It breaks down when iodine reacts with
Answers (1)
The correct option is Option 3) It does not contain complex helices and hence cannot hold iodine molecules.
Cellulose is a polysaccharide composed of glucose units linked together in a linear chain. It is a major component of plant cell walls and provides structural support to plants. When iodine reacts with certain polysaccharides, such as starch, a blue color complex is formed. However, cellulose does not form a blue color with iodine.
This is because cellulose does not contain complex helices, which are necessary for the formation of the blue color complex with iodine. Starch, on the other hand, has a helical structure that allows iodine molecules to fit into the helical spaces, forming a blue color complex.
Cellulose has a more linear and rigid structure, lacking the helical arrangement required for the interaction with iodine molecules. Therefore, when iodine reacts with cellulose, it does not form the blue color complex observed with other polysaccharides like starch.
Hence, Option 3) It does not contain complex helices and hence cannot hold iodine molecules is the correct explanation for why cellulose does not form a blue color with iodine.
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