Each of the following options contains a set of few molecules, Identify the option(s) where all the molecules possess permanent dipole moment at room temperature.

B F_{3}, O_{3}, S F_{6} X e F_{6}

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B e C l_{2}, C O_{2}, B C l_{3}, C H C l_{3}

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S O_{2}, C_{6} H_{5} C l

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N O_{2}, N H_{3}, P O C l_{3}, C H_{3} C l

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Solution

The correct option is D $N O_{2}, N H_{3}, P O C l_{3}, C H_{3} C l$
If two identical dipole vectors are oriented at an angle of $180^{\circ}$ to each other, they cancel each other resulting in zero net dipole moment. eg. $C O_{2}$ and $B e C l_{2}$

If three identical dipole vectors are oriented at an angle of $120^{\circ}$ , they cancel each other out resulting in zero net dipole moment. eg $B F_{3}$

$S F_{6}$ also has a perfectly symmetrical octahedral geometry. Hence it also does not possess permanent dipole moment at room temperature.

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