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Starch gives ...

Question

Starch gives blue colour with iodine but why glycogen doesn't? As both have helical structure

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Solution

Starch has less branching than glycogen this means it has more helical structure which is formed by linear chain thus occupy more iodine thus more intense blue black color as compare to glycogen iodine complex

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Q. Read the following statements:
i) Chitin, starch, glycogen and agar-agar are homopolymers ii) In a glycogen, the left end is called the non-reducing end
iii) Starch forms helical secondary structures but cellulose does not contain complex helices.
iv) Cellulose Can easily hold iodine.
v) Chitin is a storage polysaccharide How many of the above statements are correct?

Study the given statements and select the correct answer.
(i)Cellulose is a homopolymer of glucose.
(ii)Inulin is a homopolymer of fructose.
(iii)Starch gives blue colour and glycogen gives red colour with iodine solution.

(iv)Cellulose gives no colour with iodine solution.

On treatment with iodine, the presence of starch gives blue-black colour because

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Q. Iodine gives blue colour with:

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