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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
Which of the following is halogen exchange reaction?
  • A
    $\text{RX}+\text{NaI}\xrightarrow{ \ \ \ \ \ \ \ \ \ \ }\text{RI + NaX}$
  • B
     

    1. C
      $\text{R}-\text{OH + HX}\xrightarrow{\ \ \text{ZnCl}_2\ \ }\text{R}-\text{X + H}_2\text{O}$
    2. D
       

    ✓

    Answer

    1. $\text{RX}+\text{NaI}\xrightarrow{ \ \ \ \ \ \ \ \ \ \ }\text{RI + NaX}$

    Explanation:

    Halogen exchange reactions are those reactions in which one halide replaces another. This reaction is known as Finkelstein reaction. In

    1. Halogen (-X) is replaced by iodine.
    2. Addition of hydrogen halide on alkene.
    3. Halogen replaces alcoholic group.
    4. Halogen replaces the hydrogen of benzoic ring.

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