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Shape and Geometry Using VSEPR

Which of the ...

Question

Which of the following molecules have zero dipole moment?

B F_{3}

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C H_{2} C l_{2}

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N F_{3}

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S O_{2}

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Solution

The correct option is A $B F_{3}$
$B F_{3}$ is trigonal pyramidal, which is symmetric. Hence all individual dipole moments get cancelled.

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(B F_{3}, N F_{3}

N H_{3})

H_{2} O, C O_{2}, C C l_{4}, C H C l_{3}, N H_{3}, B F_{3}, B e F_{2}

S O_{2}

N H_{3}

H_{2} S

C_{2} H_{4}

S F_{6}

C H_{2} C l_{2}

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

{N H}_{3}

{N F}_{3}

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