Carbanion
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The removal of a hydrogen atom on a carbon atom in an organic molecule as a proton results in a species that has a formal charge of -1 on a carbon atom. It is called a carbanion.
eg:
Some carbanions are resonance stabilized, in which case some or all resonance forms fit the above definition.
eg. 1:
eg. 2:
see also alkyl carbanion, aryl carbanion, carbanion equivalent, aryl carbocation