In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which a-hydrogen has been replaced by halogen. The reaction is known as

  1. A

    Wolff-kischner reaction

  2. B

    Etard reaction

  3. C

    Hell-Volhard-zelinsky reaction

  4. D

    Rosenmund reaction

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    Solution:

    The reaction is known as the Hell-Volhard-Zelinsky reaction.

    Carboxylic acids are alpha-bromated in this process. In the presence of a little quantity of red phosphorous, carboxylic acids react with chlorine or bromine to produce alpha halo carboxylic acids. 

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