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

1.	In which of the following pairs the two species are not isostructural ?
Answer» `PCl_(4)^(+) and SiCl_(4)` `PF_(5) and BrF_(5)` `AlF_(6)^(3-) and SF_(6)` `CO_(3)^(2-) and NO_(3)^(-)` Solution :`PF_(5) and BrF_(5)` `PF_(5) rArr` trigonal bipyramidal `BrF_(5) rArr` square pyramidal `AIF_(6)^(3-) and SF_(6)` both are octahedral, `CO_(3)^(2-) and NO_(3)^(-)` both are trigonal PLANAR.

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