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Cellulose does not form blue colour with Iodine because:

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

Solution & Step-by-step Explanation

[Image comparing the structures of starch and cellulose]Starch forms a blue-black colour with iodine because it has a helical secondary structure that can trap iodine molecules. Cellulose, however, is a linear polymer of -glucose and does not form complex helices; therefore, it cannot trap or hold iodine molecules.

Practice this question

Try it yourself before checking the explanation above.

Cellulose does not form blue colour with Iodine because:
A
It is a disaccharide.
B
It is a helical molecule.
C
It does not contain complex helices and hence cannot hold iodine molecules.
D
It breaks down when iodine reacts with it.

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