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Question

Starch is a mixture of two components, a water soluble component amylose(15-20%) and a water insoluble component amylopectin (80-85%). The aqueous solution of amylose gives a blue colour with iodine solution due to the formation of:

A
amylose iodide
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B
amylose iodate
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C
inclusion complex
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D
amylose tetraiodide complex
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Solution

The correct option is D inclusion complex
Inclusion complex is a host-guest addition compound.

The space available within the crystal lattice of the host molecule, i.e., amylose is in the form of tunnels and the size of the tunnels is such that it can easily accommodate guest molecules, i.e., iodine molecules to form an addition compound called the inclusion complex.

The blue colour, however, disappears on heating and reappears on cooling.

Option C is correct.

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