Between carbon monoxide, CO, and carbon dioxide, CO2, which statement best describe the carbon-oxygen bond?

Question

BlackTom AI · Accepted Answer

Let's parse the question first: it asks which statement best describes the carbon-oxygen bond when comparing CO and CO2.
Option 1 says the CO bond is stronger and longer than in CO2. This claims a longer bond for CO, but in reality a stronger bond is usually shorter; CO has a stronger, shorter bond due to a triple bond character, whereas CO2 features two double bonds, which are shorter than a typical single bond but longer than a triple bond. The combination of bond type and bond order is crucial here, making this option suspect because it also claims CO is longer, which contradicts known bond lengths.
Option 2 states that the CO2 bond is stronger and shorter than the CO bond. While CO2 does have strong double bonds, the individual C=O bonds in CO2 are not as strong or as short as a C≡O bond would be in CO, because a triple bond is typically shorter and stronger than a double bond. This option mischaracterizes the relative bond order and strength between CO and CO2.
Option 3 asserts that the CO2 bond is stronger and longer than the CO bond. The idea of a longer bond paired with greater strength is inconsistent: generally, higher bond strength correlates with shorter bond length, and CO’s bond is understood to be a triple bond (higher order) compared to CO2’s double bonds, which would lead to a shorter, stronger bond in CO than in CO2. This option thus mixes up the standard relationship between bond order, length, and strength.
Option 4 claims that the CO bond is stronger and shorter than in CO2. This aligns with the standard description: CO has a higher bond order (roughly triple bond character) giving a shorter bond, while CO2 has two C=O double bonds with somewhat longer individual bonds and slightly weaker character compared to a triple bond. This explanation reconciles bond order, length, and typical bond-strength trends across CO and CO2.
Overall, evaluating the logical consistency between bond type (single/double/triple), bond length, and bond strength helps distinguish the correct statement from the distractors. The distractors either invert the relationship between bond length and strength or misstate which molecule contains the shorter/stronger C–O bond, leading to inaccurate comparisons.

Between carbon monoxide, CO, and carbon dioxide, CO2, which statement best describe the carbon-oxygen bond?

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