Chemical Bonding And Molecular Structure Question 545
Question: Among the following the pair in which the two species are not isostructural is [CBSE PMT 2004]
Options:
A) $ BH_4^{-} $ and $ NH_4^{+} $
B) $ PF_6^{-} $ and $ SF_6 $
C) $ SiF_4 $ and $ SF_4 $
D) $ IO_3^{-} $ and $ XeO_3 $
Show Answer
Answer:
Correct Answer: C
Solution:
$ SiF_4 $ has symmetrical tetrahedral shape which is due to $ sp^{3} $ hybridization of the central sulphur atom in its excited state configuration. $ SF_4 $ has distorted tetrahedral or Sea- Saw geometry which arise due to $ sp^{3}d $ hybridization of central sulphur atom and due to the presence of lone pair of electron in one of the equatorial hybrid orbital.
