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Definitions of Vocabulary

Alkanes, Alkenes, Alkynes

Models and Naming of Organic Molecules

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Alkanes, Alkenes, and Alkynes

Alkanes

Alkanes are hydrocarbons with only single bonds between the atoms.
Alkanes can be either straight-chain or branched-chain . Straight-chain alkanes are the simplest.
The number of carbons in each chain determine the name.
The Alkanes
Name Molecular Formula Condensed Structural Formula
Methane CH4 CH4
Ethane C2H6 CH3CH3
Propane C3H8 CH3CH2CH3
Butane C4H10 CH3CH2CH2CH3
Pentane C5H12 CH3CH2CH2CH2CH3


For more information about naming alkanes, see the Models and Naming of Organic Molecules Section.

Alkenes and Alkynes

Alkenes are hydrocarbons with at least one double bond. Alkynes are hydrocarbons with at least one triple bond.

They are named in the same way as alkanes, but instead of an -ane suffix, an -ene or -yne suffix is used.


For more information about naming alkenes and alkynes, see the Models and Naming of Organic Molecules Section.