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NEET Chemistry NEET PYQ-Carboxylic Acids

  • question_answer
    The\[-OH\]group of an alcohol or the \[-COOH\]group of a carboxylic acid can be replaced by\[-Cl\]using: [AIPMT (S) 2004]

    A) phosphorus pentachloride

    B) hypochlorous acid

    C) chlorine

    D) hydrochloric acid

    Correct Answer: A

    Solution :

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


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