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JEE Main levelSingle correct optionDifficulty 2 of 3o2078

2-Methylpropene, , is treated with HBr in the presence of benzoyl peroxide. The major product is

  1. A1-bromo-2-methylpropane
  2. B1-bromobutane
  3. C1,2-dibromo-2-methylpropane
  4. D2-bromo-2-methylpropane

Answer: A

adds to the less substituted carbon so that the more stable tertiary radical forms. H-atom transfer from HBr then gives , 1-bromo-2-methylpropane.
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