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JEE Advanced2024Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. A[ PF ₄ ]⁺ [ PF ₆ ]⁻ and [ PCl ₄ ]⁺ [ PF ₆ ]⁻
  2. B[ PCl ₄ ]⁺ [ PCl ₄ ~F ₂ ]⁻ and [ PCl ₄ ]⁺ [ PF ₆ ]⁻
  3. CPF ₃ and PCl ₃
  4. DPF ₅ and PCl ₃

Correct answer

B. [ PCl ₄ ]⁺ [ PCl ₄ ~F ₂ ]⁻ and [ PCl ₄ ]⁺ [ PF ₆ ]⁻

Step-by-step solution

PCl ₅ when fluorinated in a polar organic solvent, ionic isomers are formed. [ PCl ₄⁺ ] [ PCl ₄ ~F ₂ ]⁻ (colorless crystals) [ PCl ₄⁺ ] [ PF ₆ ]⁻ (white crystals)

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