The pair of specied having the same bond order is :

Options

A. `O_(2)^(-),B_(2)`
B. `O_(2)^(+),NO^(+)`
C. `NO^(+),CO,`
D. `NO_(2),O_(2).`

Answer

A

Explanation

`O_(2)^(-)(B.O.=1)," "B_(2)(B.O.=1)`
`O_(2)^(+)(B.O.=2.5)," "NO^(+)(B.O.=3)`
`NO^(+)(B.O.=2.5)," "CO(B.O.=3)`
`NO_(2)(B.O.=3)O_(2)" "(B.O.=2)`
`thereforeO_(2)^(-)and B_(2)` have same bond order
For detais, consult Section 4.32.