Four diatomic species are listed below in different sequences. Which of these presents…

Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order?

\(\mathrm{O}_{2}^{-}<\mathrm{NO}<\mathrm{C}_{2}^{2-}<\mathrm{He}_{2}^{+}\)
\(\mathrm{NO}<\mathrm{C}_{2}^{2-}<\mathrm{O}_{2}^{-}<\mathrm{He}_{2}^{+}\)
\(\mathrm{C}_{2}^{2-}<\mathrm{H} \mathrm{e}_{2}^{+}<\mathrm{NO}<\mathrm{O}_{2}^{-}\)
\(\mathrm{He}_{2}^{+}<\mathrm{O}_{2}^{-}<\mathrm{NO}<\mathrm{C}_{2}^{2-}\)

Answer

(D) He _ 2 ^ + < O _ 2 ^ - < NO < C _ 2 ^ 2-

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