JEE Main & Advanced Chemistry Carboxylic Acids Question Bank Preparation of Carboxylic Acids and Their Derivatives

  • question_answer
    Which reaction is used for the preparation of \[\alpha -\] Bromoacetic acid?        [MP PET 2004; MP PET/PMT 1998]

    A) Kolbe's Reaction

    B) Reimer-Tiemann Reaction

    C) Hell volhard Zelinsky Reaction

    D) Perkin's Reation

    Correct Answer: C

    Solution :

    When \[C{{l}_{2}}\] or \[B{{r}_{2}}\] is react with carboxylic acid in the presence of red phosphorus then a-hydrogen of carboxylic acid is replaced by \[C{{l}_{2}}\] or \[B{{r}_{2}}\]                    \[\underset{Acetic\,acid}{\mathop{C{{H}_{3}}COOH}}\,\xrightarrow{B{{r}_{2}}}\underset{\alpha -bromo\,acetic\,acid}{\mathop{C{{H}_{2}}BrCOOH}}\,\]                                 This reaction is known as Hell Volhard Zelinsky reaction.


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