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

1. SiF4 and SF4
2. IO3− and XeO3
3. BH4− and NH4+
4. PF6− and SF6

Correct answer: SiF4 and SF4

Solution

SiF4 is tetrahedral, while SF4 is seesaw-shaped due to the presence of a lone pair on sulfur. Hence, they are not isostructural.

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