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

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

a

[PF4]+ [PF6]– and [PCl4]+ [PF6]–

b

[PCl4]+ [PCl4F2]– and [PCl4]+ [PF6]–

c

\({\mathrm{PF}}_{3}\) and \({\mathrm{PCl}}_{3}\)

d

\({\mathrm{PF}}_{5}\) and \({\mathrm{PCl}}_{3}\)

✓ Correct answer: b)

[PCl4]+ [PCl4F2]– and [PCl4]+ [PF6]–

Explanation

In a polar solvent, PCl5 undergoes auto-ionization to form ionic species [PCl4]+ [PCl6]–. Upon fluorination, fluorine, being more electronegative and smaller, tends to replace chlorine in the coordination sphere. This results in the formation of ionic isomers such as [PCl4]+ [PCl4F2]– and [PCl4]+ [PF6]–.

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