Order the following species with respect to carbon

Order the following species with respect to carbon–oxygen bond length (longest to shortest). $$\mathrm{CO}, \quad \mathrm{CO}_{2}, \quad \mathrm{CO}_{3}^{2-}, \quad \mathrm{CH}_{3} \mathrm{OH}$$ What is the order from the weakest to the strongest carbon–oxygen bond? $\left(\mathrm{CH}_{3} \mathrm{OH} \text { exists as } \mathrm{H}_{3} \mathrm{C}-\mathrm{OH} .\right)$

Order the following species with respect to carbon–oxygen bond length (longest to shortest).
$$\mathrm{CO}, \quad \mathrm{CO}_{2}, \quad \mathrm{CO}_{3}^{2-}, \quad \mathrm{CH}_{3} \mathrm{OH}$$
What is the order from the weakest to the strongest carbon–oxygen bond? $\left(\mathrm{CH}_{3} \mathrm{OH} \text { exists as } \mathrm{H}_{3} \mathrm{C}-\mathrm{OH} .\right)$

Key Concepts

Bond Order

Bond order refers to the number of electron pairs shared between two atoms in a chemical bond. A higher bond order generally corresponds to a shorter and stronger bond due to increased electron density between the atoms. This concept is crucial when comparing bonds in different chemical species since variations in bond order (from single, double, to triple bonds or fractional orders due to delocalization) directly affect bond lengths and strengths.

Resonance

Resonance involves the delocalization of electrons across two or more adjacent atoms in a molecule or ion. When electrons are delocalized, the effective bond order becomes fractional, as seen in species with multiple contributing structures. This delocalization can lead to bond lengths that are intermediate between those expected for single and double bonds, influencing the overall stability and properties of the molecule.

Molecular Structure and Functional Groups

The overall arrangement of atoms within a molecule and the specific functional groups present are fundamental in determining the characteristics of individual bonds. In carbon–oxygen bonds, the type of carbonyl (C=O), carboxylate, hydroxyl, or single C–O bond dictates the degree of multiple bonding and, consequently, the bond length and strength. Understanding the molecular structure helps in predicting how variations in bonding environments affect these properties.

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