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

I F_{3}, X e F_{2}

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B e C l_{2}, X e F_{2}

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T e I_{2}, X e F_{2}

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I {B r}_{2}^{-}, X e F_{2}

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Solution

The correct option is D $I {B r}_{2}^{-}, X e F_{2}$
The compounds $I {B r}_{2}^{-}$ and $X e F_{2}$ are isostructural. Both have the same number of valence electrons. Both have linear geometry as they have 3 lone pairs and 2 bond pairs of electrons. Electron pair geometry is trigonal bipyramidal and molecular geometry is linear.
Note: Isoelectronic compounds have the same number of electrons. This includes core electrons and valence electrons.

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