The correct order of pseudohalide, polyhalide and interhalogen are

The correct order of pseudohalide, polyhalide and interhalogen are
  1. $\mathrm{BrI}_{2}^{-}, \mathrm{OCN}^{-}, \mathrm{IF}_{5}$
  2. $\mathrm{IF}_{5}, \mathrm{BrI}_{2}^{-}, \mathrm{OCN}^{-}$
  3. $\mathrm{OCN}^{-}, \mathrm{IF}_{5}, \mathrm{Brl}_{2}^{-}$
  4. $\mathrm{OCN}^{-}, \mathrm{BrI}_{2}^{-}, \mathrm{IF}_{5}$

Solution

Some complex ions of nitrogen show similarities with halide ions. These are called pseudohalide ions e.g., $\mathrm{NCO}^{-}, \mathrm{CN}^{-} \mathrm{etc} .$
Halogen, among themselves, form complex ions which are called polyhalide ions. e.g., $\mathrm{I}_{3}^{-}, \mathrm{BrI}_{2}^{-}$ etc.
Similarly, interhalogens are the compounds of halogen in which one halogen is cation and other halogen is anion. E.g., $\mathrm{IF}_{7}, \mathrm{ICl}_{5}$, $\mathrm{BrF}_{3}, \mathrm{IF}_{5}$ etc .

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more P-BLOCK ELEMENTS GROUP 15 16 17 18 questions on Aicharya