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Among the following the pair in which the two species are not isostructural is 

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By Expert Faculty of Sri Chaitanya
a
BH4 and NH4+
b
PF6 and SF6
c
SiF4 and SF4
d
IO3− and XeO3

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detailed solution

Correct option is C

SiF4 has symmetrical letrahedral shape which is due to sp3 hybridization of the central sulphur atom in its excited state configuration. SF4 has distorted tetrahedral or See-Saw geometry which arise due to sp3d 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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