1.

The correct order of pseudohalide, polyhalide and interhalogen are

Answer»

`BrI_(2)^(-),OCN^(-),IF_(5)`
`IF_(5),BrI_(2)^(-),OCN^(-)`
`OCN^(-),IF_(5),BrI_(2)^(-)`
`OCN^(-),BrI_(2)^(-),IF_(5)`

Solution :Some complex ions of nitrogen show similarities with HALIDE ions. These are called pseudohalide ions e.g.. `NCO^(-),CN^(-)` etc. Halogen, among themselves, form complex ions which are called polyhalide ions e.g. `I_(3)^(-), IBrI_(2)^(-)` etc. SIMILARLY, interhalogenare the COMPOUND of halogen in which one halogen is anion. e.g., `IF_(7),ICl_(5),BrF_(3),IF_(5)` etc.


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