Which of the following is nonpolar?

{N F}_{3}

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{B F}_{3}

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{P F}_{3}

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{S F}_{4}

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Solution

The correct option is C ${B F}_{3}$
Among the given molecules the molecule $B F_{3}$ is a symmetrical molecule. The resultant dipole moment of any two $B - F$ dipoles is equal in magnitude but opposite in direction to the moment of the third one. So, the net dipole moment of the molecule is $0$ . Therefore the $B F_{3}$ molecule is nonpolar.
Hence the correct option is $B$ .

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