1. O₂, NO^+ 2. CN^-, CO 3. N₂, O₂^- 4. CO, NO

Answer: 2. CN^-, CO Key idea: compare bond orders from molecular orbital theory (isoelectronic species have equal bond orders). CN^- and CO each have 14 electrons, bond order 3. Other pairs: O₂ (2) vs NO^+ (3); N₂ (3) vs O₂^- (1.5); CO (3) vs NO (2.5).

Topic: Molecular orbital theory, bond order, bond length, bond energy· Chemical Bonding and Molecular Structure

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

1. \(O_2, NO^+\)

2. \(CN^-, CO\)

3. \(N_2, O_2^-\)

4. CO, NO

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 2. \(CN^-, CO\)

Key idea: compare bond orders from molecular orbital theory (isoelectronic species have equal bond orders).

\(\mathrm{CN^-}\) and CO each have 14 electrons, bond order 3. Other pairs: \(\mathrm{O_2}\) (2) vs \(\mathrm{NO^+}\) (3); \(\mathrm{N_2}\) (3) vs \(\mathrm{O_2^-}\) (1.5); CO (3) vs NO (2.5).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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