NEET Chemistry NEET PYQ-Carboxylic Acids

  • question_answer
    Propionic acid with \[B{{r}_{2}}-P\] yields a dibromo product. Its structure would be [AIPMT (S) 2009]

    A) \[\frac{d[B{{r}_{2}}]}{dt}=\frac{5}{3}\frac{d[B{{r}^{-}}]}{dt}\]

    B) \[\frac{d[B{{r}_{2}}]}{dt}=\frac{3}{5}\frac{d[B{{r}^{-}}]}{dt}\]

    C) \[B{{F}_{3}},NO_{2}^{-},NH_{2}^{-}\]

    D) \[{{H}_{2}}O,\]

    Correct Answer: D

    Solution :

    [d] Key Idea \[=\frac{1000}{100}=10\,\text{m}{{\text{s}}^{-1}}\] in presence of P attacks on \[{{v}_{s}}=10+10=20m{{s}^{-}}^{1}\]carbon atom of acid and \[T=\frac{2\pi r}{v}=\frac{2\pi }{v}\times \frac{mv}{Bq}\] hydrogen is substituted by bromine.
    \[T=\frac{2\pi m}{Bq}\]
    This reaction is called Hell-Volhard Zelinsky (HVZ) reduction.


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