KCET · Chemistry · Hydrocarbons
Peroxide effect is observed with the addition of HBr but not with the addition of HI to unsymmetrical alkene because
- A \(\mathrm{H}-\mathrm{I}\) bond is stronger than \(\mathrm{H}-\mathrm{Br}\) and is not cleaved by the free radical
- B \(\mathrm{H}-\mathrm{I}\) bond is weaker than \(\mathrm{H}-\mathrm{Br}\) bond so that iodine free radicals combine to form iodine molecules
- C Bond strength of HI and \(\mathrm{HBr}\) are same but free radicals are formed in \(\mathrm{HBr}\)
- D All of the above
Answer & Solution
Correct Answer
(B) \(\mathrm{H}-\mathrm{I}\) bond is weaker than \(\mathrm{H}-\mathrm{Br}\) bond so that iodine free radicals combine to form iodine molecules
Step-by-step Solution
Detailed explanation
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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