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Which of the following is a polar molecule?
A
$XeF_4$
B
$BF_3$
C
$SF_4$
D
$SiF_4$
Detailed Solution
An unsymmetrical distribution of the electron cloud makes a molecule polar.
$XeF_4$ (square planar), $BF_3$ (trigonal planar) and $SiF_4$ (tetrahedral) are symmetrical, $\mu = 0$.
$SF_4$ has a see-saw shape with one lone pair, so $\mu \ne 0$.
$XeF_4$ (square planar), $BF_3$ (trigonal planar) and $SiF_4$ (tetrahedral) are symmetrical, $\mu = 0$.
$SF_4$ has a see-saw shape with one lone pair, so $\mu \ne 0$.