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MHT CET202019 Oct 2020Morning ShiftChemistryCarboxylic Acid DerivativesActual

Which of the following reactions involves -halogenation of carboxylic acid?

Options

  1. AGattermann reaction
  2. BRiemer - Tiemann reaction
  3. CSandmeyer reaction
  4. DHell-Vohlard-Zelinsky reaction

Correct answer

D. Hell-Vohlard-Zelinsky reaction

Step-by-step solution

Hell Volhard Zelinsky (HVZ) reaction: This reaction involves alpha bromination of carboxylic acids. Carboxylic acids react with chlorine or bromine in presence of small amount of red phosphorous to give alpha halo carboxylic acids. CH ₃- CH ₂- COOH Br ₂ / P CH ₃- CHBr - COOH Br ₂ / P CH ₃- CBr ₂- COOH Br ₂ / P No further reaction.

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