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}

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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

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