How many of the following ions have bond order of 2.5? N_2^-, NO^-, O_2^-, N_2^+, C_2^ 2- , CN^+

JEE Main Chemistry question

How many of the following ions have bond order of 2.5?

Answer: 2

(15 valence e-): bond order 2.5. (13 valence e-): bond order 2.5. The others:

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Question ID VK-156884