Which is longer, the carbon-oxygen single bond in a carboxylic acid or the carbon-oxygen bond in

step 1 In this problem, we are asked, which is longer? The carbon -oxygen single bond in a carboxylic a

Which is longer, the carbon-oxygen single bond in a...

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Key Concepts

Electronic Effects of Functional Groups

Different functional groups affect the electron distribution around bonds and can alter bond lengths. In carboxylic acids, the ability of the oxygen atoms to participate in resonance results in bonds with partial double-bond character, whereas in alcohols the carbon-oxygen bond is purely single without such delocalization, generally leading to a longer bond length.

Bond Length and Bond Order

Bond length is influenced by bond order—the number of bonds between two atoms. Higher bond orders result in shorter bonds because the atoms are held together more strongly. When a bond has partial double-bond character due to electron delocalization, its effective bond order increases, leading to a reduction in bond length compared to a typical single bond.

Resonance

Resonance involves the delocalization of electrons across several atoms, which can distribute and share double-bond character among multiple bonds. In functional groups such as carboxylic acids, resonance causes the carbon-oxygen single bond to acquire partial double-bond character, making it shorter than a standard carbon-oxygen single bond, as seen in alcohols.

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