Types of Functional Groups:Multiple Carbon-Carbon Bonds ■Alkenes have a C-C double bond ■Alkynes have a C-C triple bond ■Arenes have special bonds that are 一C三C represented as alternating single and Alkene Alkyne Arene (aromatic ring） double C-C bonds in a six-membered ring Because of their structural similarities,these compounds also have chemical similaritiesTypes of Functional Groups: Multiple Carbon–Carbon Bonds „ Alkenes have a C-C double bond „ Alkynes have a C-C triple bond „ Arenes have special bonds that are represented as alternating single and double C-C bonds in a six-membered ring „ Because of their structural similarities, these compounds also have chemical similarities