- **Alkanes**: Hydrocarbons only having C-C and C-H bonds - **Acyclic Alkanes**: $C_{n}H_{2n+2}$ Linear or branched chains of carbon atoms - **Cyclic Alkanes**: $C_{n}H_{2n}$ Carbon atoms form a ring/cycle - **Alkenes**: Hydrocarbons with one or more double bonds, can be linear or cyclic - **Alkynes**: Hydrocarbons with one or more triple bonds