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Alkenes are unsaturated hydrocarbons, meaning that there is a C=C bond present. They, like alkanes, are non polar molecules so are relatively insoluble in water.
The first 4 alkenes are slightly different to the first 4 alkanes as there MUST be a C=C bond.
Molecular formula shows the number and type of atoms present in a molecule, remember that for alkenes they will follow the general formula from before.
Naming alkenes follows the same structure as naming alkanes, however you must also indicate where the C=C bond(s) are in the molecule.
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