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Which of the following pairs of compounds is isoelectronic and isostructural?

1. TeI2, XeF2
2. IBr2−, XeF2
3. IF3, XeF2
4. BeCl2, XeF2

Correct answer: IBr2−, XeF2

Solution

Isoelectronic species have the same number of electrons, and isostructural species have the same geometry. Both IBr2− and XeF2 have 22 electrons and a linear structure, making them isoelectronic and isostructural.

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