MHT CET · Chemistry · Carboxylic Acid Derivatives
Which of the following acids, does NOT undergo Hell-Vohlard-Zelinsky reaction?
- A Butanoic acid
- B Propanoic acid
- C Ethanoic acid
- D Methanoic acid
Answer & Solution
Correct Answer
(D) Methanoic acid
Step-by-step Solution
Detailed explanation
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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