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AMU Medical AMU Solved Paper-2015

  • question_answer
    The chemical reaction,\[R-C{{H}_{2}}COOH\,\,\xrightarrow[(ii)\,\,{{H}_{2}}O]{(i)\,{{X}_{2}}/redphosphorus}R\]\[-\underset{\begin{smallmatrix}  | \\  X \end{smallmatrix}}{\mathop{C}}\,H-COOH\]is known as

    A)  Hunsdiecker reaction

    B)  Vilsmeier reaction

    C)  Finkelstein reaction

    D)  Hell-Volhard-Zelinsky reaction

    Correct Answer: D

    Solution :

                     In Hell-Volhard-Zelinsky reaction, a-hydrogen of a carboxylic acid can be replaced by halogen using red phosphorus. \[R-C{{H}_{2}}COOH+{{X}_{2}}\xrightarrow{\operatorname{Re}d\,P}R-\underset{\begin{smallmatrix}  | \\  X \end{smallmatrix}}{\mathop{C}}\,H-COOH\]\[\alpha \]-halogenated acids are in fact good starting material for preparing other a-substituted acids.


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