A) \[CO_{3}^{2-}>C{{O}_{2}}>CO\]
B) \[C{{O}_{2}}>CO>CO_{3}^{2-}\]
C) \[CO>C{{O}_{2}}>CO_{3}^{2-}\]
D) None of these
Correct Answer: A
Solution :
From valency bond theory, bond order in CO, i.e. \[:\overset{-}{\mathop{C}}\,\equiv \overset{+}{\mathop{O}}\,:\] is 3, that of \[O=C=O\] is 2 while that of \[CO_{3}^{2-}\] ion is 1.33. Since the bond length increases as the bond order decreases, i.e. \[CO<C{{O}_{2}}<CO_{3}^{2-}\].
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