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Peroxide effect is observed with the addition of HBr but not with the addition of HI to unsymmetrical alkene because
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$\mathrm{H}-\mathrm{I}$ bond is weaker than $\mathrm{H}-\mathrm{Br}$ bond so that iodine free radicals combine to form iodine molecules
Peroxide effect is observed with addition of $\mathrm{HBr}$ but not with the addition of $\mathrm{H}$ - I to unsymmetrical alkene because $\mathrm{H}-\mathrm{I}$ bond is weaker than H-Br bond. So, unstable iodine free radicals combine to form stable iodine molecules as
i.e.,
i.e.,
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