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MHT CET202620 April 2026Evening ShiftChemistryHaloalkanes and HaloarenesActual

What is the major product formed when 2-bromopentane reacts with alcoholic KOH?

Options

  1. APent-1-ene
  2. BPent-2-ene
  3. CPentane
  4. DPentan-2-ol

Correct answer

B. Pent-2-ene

Step-by-step solution

Reaction of 2-bromopentane with alcoholic KOH undergoes dehydrohalogenation (E2 elimination). CH₃-CH(Br)-CH₂-CH₂-CH₃ alc. KOH, CH₃-CH=CH-CH₂-CH₃ + CH₂=CH-CH₂-CH₂-CH₃ According to Zaitsev's rule, the more substituted alkene is formed as the major product. Pent-2-ene is a disubstituted alkene, whereas pent-1-ene is a monosubstituted alkene. Thus, pent-2-ene is the major product. Answer: Pent-2-ene

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