Answer on Organic Chemistry Question for naeim
why carbanion shows sp2 hybridisation when it is conjugated?
tetrahedral. The tetrahedron can undergo inversion or retain its stereochemistry depending on the attached substitutents. A methyl carbanion has a barrier to inversion of about 2 kcal/ mole. The trifluoromethyl carbanion has a barrier of 120 kcal/mole. A fluorine atom is however more stabilizing than a hydrogen atom because of the fluorine electronegativity. Carbanion have sp2 hybridisation when attached to conjugative groups like olefine, ketone.
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