Carbon-carbon double bond
A carbon to carbon double bond is a bond between two carbon atoms. This bond consists of the sigma bond and one pi bond. A carbon-carbon double bond is shorter and stronger than that of its single counterpart. It is denoted by two lines connecting carbon molecules together, thus: C=C .
This bond is the main component of the alkene functional group. Carbon to carbon double bonds can often form part of a resonance structure with other atoms in a molecule, such as that in the benzene ring.
The geometric arrangement of atoms around a carbon-carbon double bond (C=C bond) is bent; in that there are two carbon atoms, this geometric arrangement is sometimes called double- or dual- bent. This arrangement can be seen in the diagram of ethene: http://chemistry.guide.ac/thumbs/ethene.jpg
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