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Valence Bond Theory

Why NF3 is ...

Question

Why $N F_{3}$ is pyramidal but $B F_{3}$ is triangular planar ?

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Solution

In $N F_{3}, N$ has the hybridisation $s p^{3}$ with one position occupied by lone pair of electrons but in $B F_{3}, B$ has the hybridisation $s p^{2} .$

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$B F_{3} a n d N F_{3}$ both molecules are covalent, but $B F_{3}$ is non-polar and $N F_{3}$ is polar. Its reason is

B F_{3}

molecule is planar but

N F_{3}

is pyramidal. Reason: N atom is smaller than B.

Read the above assertion and reason and choose the correct option regarding it.

N H_{3}

has a net dipole moment but

B F_{3}

does not because

B F_{3}

N F_{3}

are covalent compounds.

B F_{3}

is non-polar while

N F_{3}

is polar. The reason is that:

B F_{3}

N F_{3}

both molecules are covalent, but

B F_{3}

is non-polar and

N F_{3}

is polar. Its reason is:

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