Chemical Bonding and Molecular Structure - Result Question 112
####115. The correct order of $C-O$ bond length among $CO, CO_3^{2-}, CO_2$ is
[2007]
(a) $CO<CO_3{ }^{2-}<CO_2$
(b) $CO_3{ }^{2-}<CO_2<CO$
(c) $CO<CO_2<CO_3{ }^{2-}$
(d) $CO_2<CO_3{ }^{2-}<CO$
Show Answer
Solution:
- (c) All these structures exhibits resonance and can be represented by the following resonating structures.
- $
- \begin{equation*}
- \overline{C} \equiv \stackrel{+}{O}: \longleftrightarrow: C=\ddot{O}: \tag{i} \end{equation*} $
More is the single bond character. More will be the bond length. Hence, the corret order is :
$ CO<CO_2<CO_3^{2-} $
