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KCET2021ChemistryHydrocarbons

Peroxide effect is observed with the addition of HBr but not with the addition of HI to unsymmetrical alkene because

Options

  1. AH - I bond is stronger than H - Br and is not cleaved by the free radical
  2. BH - I bond is weaker than H - Br bond so that iodine free radicals combine to form iodine molecules
  3. CBond strength of HI and HBr are same but free radicals are formed in HBr
  4. DAll of the above

Correct answer

B. H - I bond is weaker than H - Br bond so that iodine free radicals combine to form iodine molecules

Step-by-step solution

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

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