The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are
- [PF4]+[PF6]- and [PCl4]+[PF6]-
- [PCl4]+[PCl4F2]- and [PCl4]+[PF6]-
- PF3 and PCl3
- PF5 and PCl3
The Correct Option is B
Solution and Explanation
To solve the problem, we analyze the fluorination reaction of phosphorus pentachloride (PCl5) in a polar organic solvent.
Fluorination of PCl5:
When PCl5 reacts with fluorine or a fluorinating agent in polar organic solvents, it often forms ionic species due to ligand exchange and formation of complex ions.
Known species formed:
- The cation [PCl4]+ (tetrachlorophosphonium ion)
- The anion [PF6]- (hexafluorophosphate ion)
These ions result from partial substitution of chlorine by fluorine in PCl5 and subsequent complex formation.
Therefore, the species formed are:
\[
[PCl_4]^+ [PF_6]^-
\]
Final Answer:
\[
\boxed{\text{[PCl}_4]^+ \text{[PF}_6]^-\ \text{and not the other species}}
\]
which corresponds to the second option:
[PCl4]+[PCl4F2]- and [PCl4]+[PF6]-
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