Bond dissociation energy | Bonding Theories

Chapter 10 - Bonding Theories

Arrange the following molecular ions in order of increasing bond dissociation energy:

N₂⁺, NO⁺, O₂⁺, Li₂⁺, Be₂⁺

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Solution

Higher bond order ⇒ stronger bond ⇒ higher bond dissociation energy

Bond order: N₂⁺ = 2.5, NO⁺ = 3, O₂⁺ = 2.5, Li₂⁺ = 0.5, Be₂⁺ = 0.5

In order of increasing bond dissociation energy:
Li₂⁺ ~ Be₂⁺ < N₂⁺ ~ O₂⁺ < NO⁺

General Chemistry 1 - Bond dissociation energy