Which of the following pairs of compound is isoelectronic and isostructure ?

Options

A. `BeCl_(2) , XeF_(2)`
B. `Tel_(2), XeF_(2)`
C. `Ibr_(2)^(-) , XeF_(2)`
D. `IF_(3), XeF_(2)`

Answer

C

Explanation

`IBr_(2)^(-) = 7 + 7 xx+ 2 + 1 =22` electrons
`XeF_(2) = 8 + 7 xx2 = 22 ` electrons
Therefore, both the species are isoelectronic.
In both the species, the central atoms undergo
`sp^(3)` d-hybriduzation giving trigonal bipyramidal
geometry where three equatorial position are
occupied by lone pairs of electrons giving a linear
shape to `IB_(2)^(-) and XeF_(2)` as shown in the structures below :

Thus , these two species are also isostructural.