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B
Fat
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C
Carbohydrate
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D
Chitin
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Solution
The correct option is B Carbohydrate
The iodine test is used to check the availability of starch like carbohydrates in a sample.
Starch changes to a deep "blue-black" colour upon addition of aqueous solutions of the triiodide anion, because of the production of an intermolecular charge transfer component (complex). Hence, Iodine test used to detect Carbohydrate.