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Question

Iodine test detects the presence of

A
Fat
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B
Starch
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C
Protein
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D
Malaria parasite
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Solution

The correct option is D Starch
Starch is the polysaccharide of glucose. It has 2 structures- amylose and amylopectin. Amylose is a linear structure that includes alpha-D-glucose monomers linked together through alpha (1-4) glycosidic bonds. Amylose is a branched polymer in which many amylose-like chains of up to 30 glucose residues are linked through alpha (1-4) bonds, connected to one another through alpha (1-6) branch points. The iodine molecules get trapped in the amylopectin structure and thus starch gives a positive iodine test.
So, the correct option is 'Starch'

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