2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-42

  • question_answer
    The molecule \[B{{F}_{3}}\] and \[N{{F}_{3}}\] both are covalent compounds, but \[B{{F}_{3}}\]is non-polar and \[N{{F}_{3}}\]is polar. The reason is that

    A)  boron is a metal and nitrogen is a gas in uncombined state

    B)  \[B{{F}_{3}}\] bonds have no dipole moment whereas \[N{{F}_{3}}\] bond have dipole moment

    C)  atomic size of boron is smaller than that of nitrogen                                    

    D)  \[B{{F}_{3}}\] is symmetrical molecule whereas \[N{{F}_{3}}\]is unsymmetrical?

    Correct Answer: D

    Solution :

    \[B{{F}_{3}}\]is symnetrical planar, although it has polar bonds but resultant dipole moment is zero. In \[N{{F}_{3}}\]lone pair cause distortion, hence polarity.


You need to login to perform this action.
You will be redirected in 3 sec spinner