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MDCAT Chemistry QUESTION #7802
Question 1

Addition of HBr to isobutylene (2-methylpropene) mainly gives:

  • Isobutyl bromide
  • n-Butyl bromide
  • sec-Butyl bromide
  • tert-Butyl bromide✔️
Correct Answer Explanation

Markovnikov addition: H⁺ adds to less substituted alkene carbon, Br⁻ to more substituted. Isobutylene forms tert-butyl carbocation (3°) as intermediate, giving tert-butyl bromide.