Which one of the following pairs of molecules will have a permanent dipole moment for both members?

S i F_{4}

and

N O_{2}

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N O_{2}

and

S F_{6}

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N O_{2}

and

O_{3}

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S i F_{4}

and

C O_{2}

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Solution

The correct option is C $N O_{2}$ and $O_{3}$
$S F_{6}$ , $S i F_{4}$ , $C O_{2}$ are perfectly symmetrical molecules. Here the dipole in all the directions cancel out and the resutant dipole is zero. Resonance takes place in both $N O_{2}$ and $O_{3}$ . The partial charges in both the molecules cause individual dipoles to exist which in turn creates a permanent dipole moment.

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