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In which of the following set, the value of bond order will be 2.5:
A
O₂⁺, NO, NO²⁺, CN
B
CN, NO²⁺, CN⁻, F₂
C
O₂⁺, NO²⁺, O₂²⁺, CN⁻
D
O₂²⁻, O₂⁻, O₂⁺, O₂
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