The correct order of pseudohalide , polyhalide and interhalogen are :
(A)`BrI_2^-,OCN^(-),IF_5` , (B)`IF_5,BrI_2^-,OCN^(-)` , ( C)`OCN^(-),IF_5,BrI_2^(-)` , (D)`OCN^(-),BrI_2^(-),IF_5`

Options

A. `Brl_2^(-) , OCN^(-) , IF_5`
B. `IF_5 , BrI_2^(-) , OCN^(-)`
C. `OCN^(-) , IF_5, BrI_2^(-)`
D. `OCN^(-) , BrI_2^(-) , IF_5`

Answer

D

Explanation

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)^(-), BrI_(2)^(-)`, etc. Similarly, interhalogens are the compounds of halogen in which one halogen is cation and other halogen is anion. e.g. `IF_(7), ICI_(5), BrF_(3), IF_(5)` etc.