Q65 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Medium

Xenon forms several fluorides and oxofluorides which exihibit acidic behaviour. The correct sequence of descending Lewis acidity among the given species is represented by
(a)$\mathrm{XeF_6}>\mathrm{XeOF_4}>\mathrm{XeF_4}>\mathrm{XeO_2F_2}$
(b)$\mathrm{XeOF_4}>\mathrm{XeO_2F_2}>\mathrm{XeOF_4}>\mathrm{XeF_6}$
(c)$\mathrm{XeF_4}>\mathrm{XeO_2F_2}>\mathrm{XeOF_4}>\mathrm{XeF_6}$
(d)$\mathrm{XeF_4}>\mathrm{XeF_6}>\mathrm{XeOF_4}>\mathrm{XeO_2F_2}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
Fluoride-ion acceptor (Lewis acid) strength falls as fluorines are replaced by oxo groups: XeF₆ > XeOF₄ > XeF₄ > XeO₂F₂.

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