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Abstract
A covalent bond between two carbon atoms makescarbon–carbon bondformation. C-C bond composed of two electrons and that is the most common form. Sigma bond consider as acarbon–carbon single bond and is formed between one hybridized orbital from each of the carbon atoms. Various reactions promoted through carbon-carbon bond formation such as Suzuki reaction, Aldol condensation, wittig reaction, friedal craft and so on.In carbon-carbon bond, every reaction proceeds different mechanism.