Question

4. Which of the following pairs of compounds is
isoelectronic and isostructural? [NEET-2017]
(1) BeCl2, XeF2 (2) Telı, XeF2
(3) 1Br5, XeF2 (4) IF 3, XeF,
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Answer 1

The compounds  IBr2- and  XeF2 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