Chemical Bonding And Molecular Structure Ques 17

17. 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

Answer:

Correct Answer: 17.(c)

Solution:

(c) All these structures exhibits resonance and can be represented by the following resonating structures.

More is the single bond character. More will be the bond length. Hence, the corret order is :

$ CO<CO_2<CO_3^{2-} $

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