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NEET Chemistry Aldehydes, Ketones Question Bank Self Evaluation Test - Aldehydes, Ketons and Carboxylic Acids

  • question_answer
    In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which \[\alpha \]-hydrogen has been replaced by halogen. This reaction is known as:

    A) Wolff- Kishner reaction

    B) Rosenmund reaction

    C) Etard reaction

    D) Hell - Volhard - Zelinsky reaction

    Correct Answer: D

    Solution :

    [d] Hell-Volhard-Zelinsky Reaction: It is \[\alpha \]-substitution when a carboxylic acid having \[\alpha \]-hydrogens is treated with chlorine or bromine in presence of small amount of red phosphorous. \[R-C{{H}_{2}}COOH+{{X}_{2}}\xrightarrow{P}R\overset{X}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-COOH\] \[+HX(X=Cl,Br)\]


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