Aliphatic and aromatic hydrocarbons

Aliphatic and aromatic hydrocarbons are two major classes of organic compounds distinguished by their structure and chemical properties. Aliphatic hydrocarbons consist of linear, branched, or cyclic carbon chains bonded together exclusively by single (alkanes), double (alkenes), or triple (alkynes) bonds. These hydrocarbons are generally saturated (alkanes) or unsaturated (alkenes and alkynes) and exhibit relatively straightforward chemical reactivity. In contrast, aromatic hydrocarbons contain one or more benzene rings (cyclic structures of six carbon atoms with alternating single and double bonds), which impart unique stability and resonance characteristics to the molecules. Aromatic hydrocarbons are often more reactive than aliphatic hydrocarbons due to their delocalized electron system and can undergo electrophilic substitution reactions.