Molecules that have one or more double bonds between carbon atoms are called unsaturated compounds. The double bond is a covalent bond that involves the sharing of four electrons between the two carbon atoms. This type of bond is stronger than a single bond, but weaker than a triple bond. The presence of double bonds in a molecule affects its chemical and physical properties, making it more reactive and having a lower boiling point compared to similar saturated compounds. Examples of unsaturated compounds include alkenes, alkynes, and aromatic compounds.
