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

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 F_{2}^{-}, X e F_{2}

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

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Solution

The correct option is C $I F_{2}^{-}, X e F_{2}$
Both $I F_{2}^{-}$ and $X e F_{2}$ are isoelectronic as they have same number of core electrons and valence electons.

Compounds No. of electrons

$X e F_{2}$ 72

$B e C l_{2}$ 38

$T e I_{2}$ 158

$I F_{2}^{-}$ 72

$I F_{3}$ 80

The compounds $I F_{2}^{-}$ and $X e F_{2}$ are isostructural. Both have the same number of valence electrons. Both have linear shape as they have 3 lone pairs and 2 bond pairs of electrons. Electron pair geometry is trigonal bipyramidal and shape is linear.

$B e C l_{2} \to$ Linear
$T e I_{2} \to$ Bent
$I F_{3} \to$ T-shape

Hence, option (C) is the correct answer.

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