Types of functional Groups Multiple carbon-Carbon Bonds alkenes have aC-C double bond Alkynes have a C-C triple bond Arenes have special bonds that are represented as 一C≡C alternating single and Alkene Alkyne ene double c-c bonds in (aromatic ring) a SIX-membered ringTypes 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