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JEE Main levelOne or more correct optionsDifficulty 2 of 3o2030

Select the reactions that give the 1-bromo (terminal bromide) compound as the major product.

  1. A in the presence of peroxide
  2. B in the presence of peroxide
  3. C in the presence of peroxide
  4. D in the presence of peroxide

Answer: A, B

Only HBr shows the radical (peroxide) pathway; adds to the terminal carbon to give the more stable radical. So options 1 and 2 give 1-bromopropane and 1-bromo-2-methylpropane. HCl and HI add by the ionic Markovnikov route even with peroxide and give 2-chloropropane and 2-iodobutane.
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