Which of the following are non-polar?

S i F_{4}

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X e F_{4}

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S F_{4}

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B F_{3}

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Solution

The correct options are
A $S i F_{4}$
B $X e F_{4}$
D $B F_{3}$
$X e F_{4}$ has two lone pairs on $X e$ (two lone pairs on opposite cancel the dipoles)and is nonpolar.
Even though in $S F_{4}$ all the four $F$ atoms dipoles are cancelled by each other there is a lone pair on $S$ , hence it is polar.
$S i F_{4}$ , $X e F_{4}$ , $B F_{3}$
all the dipoles are cancelled each other, so non-polar.
Hence options A,B & D are correct.

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