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Why are the carbon-oxygen and oxygen-hydrogen bonds in alcohols polar?
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organic compound
The structures of organic compounds can be depicted in condensed, expanded, and three-dimensional structural formulas.
The carbon-oxygen and oxygen-hydrogen bonds in alcohols are polar because of the difference in electronegativity between the atoms involved.12
Oxygen is significantly more electronegative than both carbon and hydrogen, meaning it has a greater ability to attract the shared pair of electrons in a covalent bond toward itself. As a result of this unequal sharing:134
- The oxygen atom acquires a partial negative charge.12
- The carbon and hydrogen atoms acquire partial positive charges.12
This distribution of electrical charge creates an electric dipole, making the bonds polar. These polar bonds within the hydroxyl group are fundamental to the physical and chemical properties of alcohols, including their ability to form hydrogen bonds and their reactivity with other substances.4152