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COMEDK202510 May 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

In which one of the following pairs does the stability of the monovalent ion increase with respect to the molecule, while the magnetic character remains the same for both?

Options

  1. AN ₂ / N ₂ ⁺
  2. BO ₂ / O ₂⁺
  3. CC ₂ / C ₂⁺
  4. DB ₂ / B ₂ ⁺

Correct answer

B. O ₂ / O ₂⁺

Step-by-step solution

Stability increases when an electron is removed from an antibonding MO (bond order increases). Magnetic character remains the same if both species have the same type (both paramagnetic or both diamagnetic). (1) N₂/N₂^+ : N₂ — electron removed from bonding 2p_z , BO decreases 3 2.5 . Also N₂ is diamagnetic but N₂^+ is paramagnetic. Fails both conditions. (2) O₂/O₂^+ : O₂ — highest occupied MOs are antibonding ^*2p , BO = 2 , paramagnetic (2 unpaired electrons). O₂^+ — electron removed from ^* , BO = 2.5 (stability i

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