Alkenes & Alkynes

A. Carbon can form double and triple bonds with carbon atoms.

 B. Naming rules are almost the same as with Alkanes (single bond chains)

                a. Double bonds end in "-ene"

                b. Triple bonds end in "-yne"

                c. When numbering the base chain, double/ triple bonds always get the lowest number

 ex. 

Name: 4 Methyl 2 Pentene

ex.

Name: 4, 4 Dimethyl 4 Heptyne

ex. 

Draw 2, 3, 4 Trimethyl 1 Octene

Trans & Cis Butene

A. If 2 adjacent carbons are bonded by a double bond AND have side chains on them there are 2 possible compounds. 

     a. Cis: The side chains are on the same side as the base chain

Cis 2 Butene

     b. Trans: The side chains are on opposite sides of the base chain

Trans 2 Butene

Multiple Double Bonds

A. More than 1 double bond can exist in a molecule

B. Use the same multipliers inside the base chain name

ex. 

 1,3 Butadiene

ex. Draw 2 methyl 1,4 pentadiene