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Question: Answered & Verified by Expert
In the presence of peroxide addition of HBr to propene takes place according to anti Markovnikov’s rule but peroxide effect is not seen in the case of HCl and HI. Explain.
ChemistryHydrocarbonsNEET
Options:
  • A Peroxide effect is only observed with HBr because hydrogen bromide is less stable than HCl and HI.
  • B Peroxide effect is specific to hydrogen bromide due to the nature of the peroxide used.
  • C Peroxide effect is not observed in addition of HCl and HI. This is due to the fact that the H—Cl bond being stronger than H—Br bond is not cleaved by the free radical whereas the H—I bond is weaker and iodine free radicals combine to form iodine molecules instead of adding to the double bond.
  • D Peroxide effect is not seen with HCl and HI because their addition to alkenes is inherently Markovnikov.
Solution:
1977 Upvotes Verified Answer
The correct answer is: Peroxide effect is not seen with HCl and HI because their addition to alkenes is inherently Markovnikov.
Correct Option is : (D)
Peroxide effect is not seen with HCl and HI because their addition to alkenes is inherently Markovnikov.

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