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In which of the following pairs, the two species are not isostructural ?

1. CO3²− and NO3−
2. PCl4+ and SiCl4
3. PF5 and BrF5
4. AlF6³− and SF6

Correct answer: PF5 and BrF5

Solution

PF5 and BrF5 are not isostructural because PF5 has a trigonal bipyramidal geometry, while BrF5 has a square pyramidal geometry due to the presence of a lone pair on the bromine atom, leading to different spatial arrangements.

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