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Which of the following species does NOT exist in reality?

1. ClI3
2. XeH4
3. BiF5
4. Both ClI3 and XeH4

Correct answer: Both ClI3 and XeH4

Solution

XeH4 does not exist because hydrogen is not electronegative enough to oxidize xenon, and no Xe-H compounds are known. ClI3 does not exist because chlorine, being smaller and more electronegative than iodine, cannot act as the central atom bonded to three bulky iodine atoms. BiF5 does exist as bismuth(V) fluoride. Hence both A and B are non-existent.

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