The correct order of increasing $\mathrm{C}-\mathrm{O}$ bond length $\mathrm{of} \mathrm{CO},…

The correct order of increasing $\mathrm{C}-\mathrm{O}$ bond length $\mathrm{of} \mathrm{CO}, \mathrm{CO}_{2}$ and $\mathrm{CO}_{3}^{2-}$ is:
  1. $\mathrm{CO}_{3}^{2-} < \mathrm{CO}_{2} < \mathrm{CO}$
  2. $\mathrm{CO}_{2} < \mathrm{CO}_{3}^{2-} < \mathrm{CO}$
  3. $\mathrm{CO} < \mathrm{CO}_{3}^{2-} < \mathrm{CO}_{2}$
  4. $\mathrm{CO} < \mathrm{CO}_{2} < \mathrm{CO}_{3}^{2-}$

Solution

$$
\text { Structures of } \mathrm{CO}, \mathrm{CO}_{2} \text { and } \mathrm{CO}_{3}^{2-} \text { are : }
$$


Bond order $\propto \frac{1}{\text { Bond length }}$ Hence, the decreasing $(\mathrm{C}-\mathrm{O})$ bond length is:
$\mathrm{CO} < \mathrm{CO}_{2} < \mathrm{CO}_{3}^{2-}$ *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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