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Manipal Medical Manipal Medical Solved Paper-2007

  • question_answer
    The\[-OH\]group of an alcohol or the\[-COOH\] group of a carboxylic acid can be replaced by \[-Cl\] using

    A)  phosphorus pentachloride

    B)  hypochlorous acid

    C)  chlorine

    D)  hydrochloric acid

    Correct Answer: A

    Solution :

     The\[-OH\]group of alcohol or the\[-COOH\] group of a carboxylic acid is replaced by\[-Cl\] using phosphorus penta chloride (ie,\[PC{{l}_{5}}\]) \[\underset{Alcohol}{\mathop{ROH}}\,+PC{{l}_{5}}\xrightarrow[{}]{{}}RCl+POC{{l}_{3}}+HCl\] \[\underset{Acid}{\mathop{RCOOH}}\,+PC{{l}_{5}}\xrightarrow[{}]{{}}RCOCl+POC{{l}_{3}}+HCl\]


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