Assertion, A: Peroxide effect is not observed in the addition of HI to unsymmetrical alkene.
Reason, R: Free radical is unable to break stronger HI bonds.

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A is true, but R is false

A and R are true, R does not explain A

A and R are true, R explains A

A is false, but R is true

answer is C.

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Detailed Solution

Peroxide effect is not observed in the case of HI because during free radical mechanism the propagation step is endothermic in nature due to weak HI bonds and also HI is oxidized by peroxide to iodine molecules under certain reaction conditions.

Thus, the assertion is correct but the reason is false.

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