The correct order of $\mathrm{C}-\mathrm{O}$ bond length in $\mathrm{CO}, \mathrm{CO}_3^{2-}$,…

The correct order of $\mathrm{C}-\mathrm{O}$ bond length in $\mathrm{CO}, \mathrm{CO}_3^{2-}$, $\mathrm{CO}_2$ is
  1. $\mathrm{CO} < \mathrm{CO}_3^{2-} < \mathrm{CO} 2$
  2. $\mathrm{CO}_3^{2-} < \mathrm{CO}_2 < \mathrm{CO}$
  3. $\mathrm{CO} < \mathrm{CO}_2 < \mathrm{CO}_3^{2-}$
  4. $\mathrm{CO}_2 < \mathrm{CO}_3^{2-} < \mathrm{CO}$

Solution


$\mathrm{O}=\mathrm{C}=\mathrm{O} ;{ }^{\ominus} \mathrm{C} \equiv \mathrm{O}^{\oplus}$ The bond length is smallest for the $\mathrm{C} \equiv \mathrm{O}$ bond due to strong triple bond. Among $\mathrm{CO}_3^{2-}$ and $\mathrm{CO}_2, \mathrm{CO}_3^{2-}$ has the smaller $\mathrm{C}-\mathrm{O}$ bond length due to resonance stabilization that makes the bond stronger.

Asked in: AP EAMCET 2023 (16 May Shift 2)

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