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MHT CET202615 April 2026Evening ShiftChemistryHaloalkanes and HaloarenesActual

Method of preparation of alkyl halide 2 R-Br + Hg ₂ F ₂ 2 R-F + Hg ₂ Br ₂ This reaction is known as

Options

  1. AFinkelstein reaction
  2. BSwartz reaction
  3. CSandmeyer reaction
  4. DWurtz reaction

Correct answer

B. Swartz reaction

Step-by-step solution

The synthesis of alkyl fluorides is best accomplished by heating an alkyl chloride or bromide in the presence of a metallic fluoride such as AgF , Hg ₂ F ₂ , CoF ₂ , or SbF ₃ . The given reaction involves the conversion of an alkyl bromide to an alkyl fluoride using mercurous fluoride ( Hg ₂ F ₂ ). 2 R-Br + Hg ₂ F ₂ 2 R-F + Hg ₂ Br ₂ This halogen exchange reaction for the preparation of alkyl fluorides is known as the Swarts reaction.

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