Alkenes are unsaturated hydrocarbons. 
1) What does the term “unsaturation” mean?2)

Give examples of names and structural formulas of Alkenes.

Methane is a molecule. A functional group is a group of atoms. They have a fix number and orientation of atoms. Functional groups can change properties when they are attached to a hydrocarbon

I need some examples of functional groups and their structural formulas.

In your own words please 

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