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

S O_{2}, C_{6} H_{5} C l, H_{2} S e, B r F_{5}

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

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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 options are
A $S O_{2}, C_{6} H_{5} C l, H_{2} S e, B r F_{5}$
D $N O_{2}, N H_{3}, P O C l_{3}, C H_{3} C l$
Both (a) and (d) are correct as each of the molecules possesses a dipole moment.

In option (b) $C O_{2}$ and in option (c) $S F_{6}$ are completely symmetrical and thus possess no dipole moment.

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