Which of the following react(s) with AsF₅ in liquid BrF₃ ?

Q1 · CSIR-NET Chemistry, June 2016

Paper: CSIR-NET June 2016 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · Marks: 2 · Difficulty: Easy

Which of the following react(s) with $\mathrm{AsF}_{5}$ in liquid $\mathrm{BrF}_{3}$ ?

(a)$\mathrm{XeF_6}$ only

(b)$\mathrm{XeF_6}$ and $\mathrm{XeF_4}$

(c)$\mathrm{XeF_6}$ and $\mathrm{XeF_2}$

(d)$\mathrm{XeF_4}$ and $\mathrm{XeF_2}$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

In BrF₃ the Lewis acid AsF₅ abstracts fluoride from good F⁻ donors: XeF₆ → [XeF₅]⁺ and XeF₂ → [XeF]⁺; XeF₄ is a very poor fluoride donor (c).

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