Chemical Bonding and Molecular Structure - Result Question 30
####31. Which of the following would have a permanent dipole moment?
(a) $SiF_4$
(c) $XeF_4$
(b) $SF_4$
(d) $BF_3$
[2005]
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Solution:
- (b) $SF_4$ has permanent dipole moment. $SF_4$ has $s p^{3} d$ hybridization and see saw shape (irregular geometry).
$ \mu \neq 0 $
Whereas $XeF_4$ shows square planar geometry, $SiF_4$ has tetrahedral shape and $BF_3$ has Trigonal planar shape. All these are symmetric molecules. Hence $ _{\mu}=0$.
