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JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank Polarisation and Fajan's rule

  • question_answer
    \[B{{F}_{3}}\] and \[N{{F}_{3}}\]both molecules are covalent, but \[B{{F}_{3}}\] is non-polar and \[N{{F}_{3}}\] is polar. Its reason is [CPMT 1989; NCERT 1980]

    A)                 In uncombined state boron is metal and nitrogen is gas

    B)                 \[B-F\]bond has no dipole moment whereas \[N-F\] bond has dipole moment

    C)                 The size of boron atom is smaller than nitrogen

    D)                 \[B{{F}_{3}}\] is planar whereas \[N{{F}_{3}}\] is pyramidal

    Correct Answer: D

    Solution :

                    \[B{{F}_{3}}\] is planar while \[N{{F}_{3}}\] is pyramidal due to the presence of lone pair of electron on nitrogen in \[N{{F}_{3}}\].


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