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ExamsJEE AdvancedChemistry

When N₂ is converted to N₂⁺, what happens to the bond dissociation energy of the N–N bond, and when O₂ is converted to O₂⁺, what happens to the bond dissociation energy of the O–O bond?

  1. increases in the first case and decreases in the second
  2. decreases in the first case and increases in the second
  3. decreases in both cases
  4. increases in both cases

Correct answer: decreases in the first case and increases in the second

Solution

When N₂ is converted to N₂⁺, the bond dissociation energy of the N–N bond decreases due to the loss of an electron, which reduces the bond order, whereas when O₂ is converted to O₂⁺, the bond dissociation energy of the O–O bond increases because the loss of an electron increases the bond order from 2 to 2.5.

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