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JEE MainChemistryChemical Bonding and Molecular Structure

Which of the following ionization processes results in BOTH an increase in the bond order and a change in magnetic behaviour from paramagnetic to diamagnetic?

Options

  1. AO ₂ O ₂^+ + e ^-
  2. BN ₂ N ₂^+ + e ^-
  3. CNO NO ^+ + e ^-
  4. DO ₂^- O ₂ + e ^-

Correct answer

C. NO NO ^+ + e ^-

Step-by-step solution

Evaluate the bond order and magnetic nature for each species before and after ionization: NO has 15 electrons. Its bond order is 2.5 and it has one unpaired electron in the ^ * orbital, making it paramagnetic. NO ^+ has 14 electrons. Its bond order is 3 and all electrons are paired, making it diamagnetic. Thus, the bond order increases and the magnetic behaviour changes from paramagnetic to diamagnetic. O ₂ (16 electrons, BO = 2 , paramagnetic) changes to O ₂^+ (15 electrons, BO = 2.5 , paramagnetic). The bond orde

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