NEET 2017 · ChemistryVSEPR shapePrevious Year Question

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

Answer: (C) $IBr X_{2} X^{-}$ , $XeF X_{2}$ . \textbf{Answer:} (C) $IBr X_{2} X^{-}$ , $XeF X_{2}$ \textbf{Solution:} $IBr X_{2} X^{-}$ and $XeF X_{2}$ each have 22 valence electrons (isoelectronic) and a central atom with 3 lone pairs + 2 bond pairs ( $A B 2 E 3$ ), giving a linear shape (isostructural).

A. $BeCl X_{2}$ , $XeF X_{2}$
B. $TeI X_{2}$ , $XeF X_{2}$
C. $IBr X_{2} X^{-}$ , $XeF X_{2}$ ✓
D. $IF X_{3}$ , $XeF X_{2}$

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) $IBr X_{2} X^{-}$ , $XeF X_{2}$ \textbf{Solution:} $IBr X_{2} X^{-}$ and $XeF X_{2}$ each have 22 valence electrons (isoelectronic) and a central atom with 3 lone pairs + 2 bond pairs ( $A B 2 E 3$ ), giving a linear shape (isostructural). $BeCl X_{2}$ is linear but not isoelectronic with $XeF X_{2}$ .

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