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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    The tendency of \[B{{F}_{3'}}\,BC{{l}_{3}}\] and \[BB{{r}_{3}}\] to behave as Lewis acid decreases in the sequence:

    A) \[BC{{l}_{3}}\,\,>\,\,B{{F}_{3}}\,\,>\,\,BB{{r}_{3}}\] 

    B) \[BB{{r}_{3}}\,\,>\,\,BC{{l}_{3}}\,\,>\,\,B{{F}_{3}}\]

    C) \[BB{{r}_{3}}\,\,>\,\,B{{F}_{3}}\,\,>\,\,BC{{l}_{3}}\] 

    D) \[B{{F}_{3}}\,\,>\,\,BC{{l}_{3}}\,\,>\,\,BB{{r}_{3}}\]

    Correct Answer: B

    Solution :

    [b] p-p overlap between B and F is maximum due to identical size and energy of p- orbitals, so electron deficiency in boron of \[B{{F}_{3}}\] is neutralized partially to the maximum extent by back donation. Hence \[B{{F}_{3}}\] is least acidic.


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