Which of the following is isoelectronic pair ?

Options

A. `ICI_2 , CIO_2`
B. `BrO_(2)^(-),BrF_(2)^(+)`
C. `CIO_(2),BrF`
D. `CN^(-),O_(3)`

Answer

B

Explanation

`BrO_(2)^(-)` and `BrF_(2)^(+)` ions are isoelectronic in name with 52 electrons each :
`BrO_(2)^(-) : (35 + 2 xx 8 + 1) = 52 , BrF_(2)^(+) : (35 + 2 xx 9 -1) = 52`