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JEE Main & Advanced Sample Paper JEE Main Sample Paper-40

  • question_answer
    During bromination of benzene in the presence of \[FeB{{r}_{3}}\]the species that attacks the ring to initiate the process is

    A) \[FeBr_{4}^{-}\]                  

    B) \[Br_{{}}^{+}\]

    C) \[Br_{{}}^{-}\]                   

    D) \[B{{r}_{2}}\]molecule

    Correct Answer: B

    Solution :

    The metallic halide (Lewi acid) polarises the halogen molecule to yield the electrophite \[{{X}^{+}}\] (halonium ion) \[FeB{{r}_{3}}+B{{r}_{2}}\xrightarrow[{}]{{}}FeB{{r}_{4}}^{-}+B{{r}^{+}}\]


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