1.

\[B{{F}_{3}}\] 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
Answer» E.


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