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

1. Isoelectronic: Same number of valence electrons.Valence electrons in ${\text{XeF}}_2=8+(2\times 7)=22$.Valence electrons in ${\text{IBr}}_2^{-}=7+(2\times 7)+1=22$.2. Isostructural: Same shape.Both ${\text{XeF}}_2$ and ${\text{IBr}}_2^{-}$ have 2 bond pairs and 3 lone pairs on the central atom. This leads to a $s{p}^{3}d$ hybridization and a linear molecular geometry.