# Which one of the following pairs of species have the same bond order?

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Which one of the following pairs of species have the same bond order?

(a) O2, NO+

(b) CN$^-$, CO

(c) N2, O2

(d) CO, NO

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Ans: (b) CN-, CO

Explanation: CN-, CO both have 14 electron in outer most shell, and bond order is 3.