question_answer

The correct order of increasing \[C-O\] bond length of \[CO,C{{O}_{2}}\] and \[CO_{3}^{2-}\] is:

A) \[CO_{3}^{2-}~<C{{O}_{2}}<CO\]  

B) \[C{{O}_{2}}<CO_{3}^{2-}<CO\]

C) \[CO<CO_{3}^{2-}<C{{O}_{2}}\]     

D) \[CO<C{{O}_{2}}<CO_{3}^{2-}\]

Correct Answer: D

Solution :

[d] Structures of CO, \[C{{O}_{2}}\] and \[CO_{3}^{2-}\] are:

Compound	CO	\[C{{O}_{2}}\]	\[C{{O}_{3}}\]
Bond order	3	2	1.33

\[Bond\text{ }order\propto \frac{1}{Bond\text{ }length}\] Hence, the decreasing \[\left( C-O \right)\] bond length is: \[CO<C{{O}_{2}}<CO_{3}^{2-}\]