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.



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