Unsaturated HydrocarbonsHydrocarbons that don’t contain all single

bonds between the carbon atoms.

Alkanes are saturated hydrocarbons.They only contain single bonds.

AlkenesHave the general formula CnH2n

Structure contains at least one double bond.When naming them, the parent chain name ends in –ene.

Name Molecular FormulaCnH2n

Structural Formula

Model

Ethene

Propene

2-Butene

Draw: 3-ethyl-1-pentene

Draw: 1,3-butadiene

Draw: 4-butyl-1-cyclohexene

Name:

C-C=C-C=C=C-C-C

AlkynesHave the general formula CnH2n-2

Structure contains at least one triple bond.When naming them, the parent chain name ends in –yne.

Name Molecular FormulaCnH2n

Structural Formula

Ethyne

1-Propyne

1-Butyne

Draw: 2-pentyne

Draw:3-ethyl-3-methyl-1-hexyne

Name: CC-C-C-C-C-C-CΞC-C

C C-C-C-C