Symmetrical Alkene
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A symmetrical alkene is an alkene in whose molecule the doubly bonded carbons bear the same ligands.
eg. 1:
In 1, each double bonded carbon bears two methyl groups. Thus, 1 is a symmetrical alkene.
eg. 2:
In 2, each doubly bonded carbon bears a methyl group and a hydrogen atom. Thus, 2 is a symmetrical alkene.
eg. 3:
In 3, each doubly bonded carbon bears a methyl group and a hydrogen atom. Thus, 3 is asymmetrical alkene.
In an organic molecule a carbon-carbon double bond in which the carbon atoms bear the same ligands is called a symmetrical double bond.
eg:
see also unsymmetrical alkene