Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Compare the carbon-oxygen bond lengths in the formate ion (HCO2), in methanol (CH3OH), and in the carbonate ion (CO32−). In which species is the carbon-oxygen bond predicted to be longest? In which is it predicted to be shortest? Explain briefly.

Interpretation Introduction


The ions which have the highest and shortest CO length from the given list have to be determined.

Concept Introduction:

Fractional bond order: The molecules which have resonance structures possess fractional bond order.

Bond order between any bonded pair of atoms X and Y:


Bond length is inversely proportional to the bond order.

A higher bond order results in a shorter bond for a given pair of atoms.


Bond order for the compounds having resonance structures can be calculated by the general equation:[If the bond pair have the atoms X and Y]


Bond order of CO bonds in HCO2is calculated as follows:


In HCO2, one CO single bond and one C=O double bond is present.

The number of shared pairs is three and there are two carbon-oxygen links.


Bond order of CO bonds in CH3OHis calculated as follows:

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