* Alkenes: These have at least one carbon-carbon double bond. Their general formula is CₙH₂ₙ, where 'n' represents the number of carbon atoms.
* Example: Ethene (C₂H₄)
* Alkynes: These have at least one carbon-carbon triple bond. Their general formula is CₙH₂ₙ₋₂, where 'n' represents the number of carbon atoms.
* Example: Ethyne (C₂H₂)
* Cyclic hydrocarbons: These can be either alkenes or alkynes, but they form a closed ring structure. Their general formulas are the same as for their linear counterparts, but they have different properties.
* Example: Cyclohexene (C₆H₁₀)
It's important to note that these are just general formulas and specific unsaturated hydrocarbons may contain other functional groups or have branched structures.
