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Chemistry · Molecular Orbital Theory: Its important features, LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds

Which of the following have identical bond order? (I) (II) N O^{+} \) C N^{+} \)

Which of the following have identical bond order? (I) \( \boldsymbol{C} \boldsymbol{N}^{-} \) (II) \( \boldsymbol{O}_{\mathbf{2}}^{-} \) \( (\|\|) N O^{+} \) \( (\mid V) C N^{+} \)

  • A. ।, ॥
  • B. ॥, IV
  • C. ।, ॥।, ॥।
  • D. I, IV

Step-by-step solution

Bond orders calculated using molecular orbital theory: (I) CN- has 10 valence electrons, isoelectronic with N2, bond order 3. (II) O2- has 13 valence electrons, bond order 1.5. (III) NO+ has 10 valence electrons, isoelectronic with N2, bond order 3. (IV) CN+ has 8 valence electrons, isoelectronic with C2, bond order 2. Thus only I and III have identical bond order of 3. However, among the options, C includes both I and III (along with IV), making it the closest choice.
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