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MHT CET202525 Apr 2025Evening ShiftChemistryHaloalkanes and HaloarenesActual

Identify the product formed when 2-Bromobutane is heated with aqueous solution of sodium hydroxide.

Options

  1. ABut-1-ene
  2. BBut -2-ene
  3. CButan -1-ol
  4. DButan -2-ol

Correct answer

D. Butan -2-ol

Step-by-step solution

2-Bromobutane ( CH₃CH(Br)CH₂CH₃ ) is a secondary alkyl halide reacting with sodium hydroxide, a strong nucleophile and base, in aqueous solution under heating. The polar protic solvent facilitates solvation and favors nucleophilic substitution. Hydroxide ion attacks the electrophilic carbon, displacing bromide via S_N2 : CH₃CH(Br)CH₂CH₃ + OH- CH₃CH(OH)CH₂CH₃ + Br^- , yielding butan-2-ol. Concurrently, elimination may occur via E2 , abstracting a -hydrogen to form either but-1-ene or but-2-ene: CH₃CH(Br)CH₂CH₃ + OH-

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