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MHT CET202013 Oct 2020Morning ShiftChemistryCarboxylic Acid DerivativesActual

Which of the following acids, does NOT undergo Hell-Vohlard-Zelinsky reaction?

Options

  1. AButanoic acid
  2. BPropanoic acid
  3. CEthanoic acid
  4. DMethanoic acid

Correct answer

D. Methanoic acid

Step-by-step solution

Carboxylic acid which contain a – hydrogen atom reacts with chlorine or bromine in presence of red phosphorus to give a – chloro or a – bromo acids. This reaction is called H.V.Z (Hell Volhard Zelinsky ) reaction. CH3COOH ? CCl3COOH(trichloroacetic acid). CH3CH2COOH ? CH3CBr2COOH (a,a-dibromopropionic acid) Due to absence of a – H atom HCOOH does not undergo HVZ reaction.

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