In the presence of peroxide, HCl and HI do not give anti-Markownikoff's addition to alkenes because:

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One of the steps is endothermic in HCl and HI

Both HCI and HI are strong acids

HCI is oxidizing and the HI is reducing

All the steps are exothermic in HCl anHI

answer is A.

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Detailed Solution

In the chain propagation steps, we have

With HCl, Step 2 is endothermic owing to strong H-Cl bond. With HI, Step 1 is endothermic owing to weak HI bond. In fact, HI is oxidised to 12 by peroxide.

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