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Unsaturated hydrocarbons with a triple bond are known as alkynes or acetylenes.
The main type of reaction that alkenes undergo is addition. This is not a trick, it is as simple as it sounds: an addition reaction is where two molecules react together completely to form one product (and only one product).
We know from our discussion of hybridisation, that the overlap of two sp2 orbitals and the additional overlap of two p orbitals forms a double bond.
The carbon carbon bond (C-C for short) is probably one of the simplest functional groups. A functional group is a group of atoms (or sometimes just one atom) that have a characteristic chemical property.