The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are :

The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are :
  1. $\left[\mathrm{PF}_4\right]^{+}\left[\mathrm{PF}_6\right]^{-}$and $\left[\mathrm{PCl}_4\right]^{+}\left[\mathrm{PF}_6\right]^{-}$
  2. $\left[\mathrm{PCl}_4\right]^{+}\left[\mathrm{PCl}_4 \mathrm{~F}_2\right]^{-}$and $\left[\mathrm{PCl}_4\right]^{+}\left[\mathrm{PF}_6\right]^{-}$
  3. $\mathrm{PF}_3$ and $\mathrm{PCl}_3$
  4. $\mathrm{PF}_5$ and $\mathrm{PCl}_3$

Solution

$\mathrm{PCl}_5$ when fluorinated in a polar organic solvent, ionic isomers are formed. $\left[\mathrm{PCl}_4^{+}\right]\left[\mathrm{PCl}_4 \mathrm{~F}_2\right]^{-}$(colorless crystals) $\left[\mathrm{PCl}_4^{+}\right]\left[\mathrm{PF}_6\right]^{-}$(white crystals)

Asked in: JEE Advanced 2024 (Paper 2)

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