explain what is geometrical isomerism????????????????/

go to www.avogadro.co.uk/oranic/isomer/htm

u'll find gud explanation 4 it 

Geometrical isomerism is a kind of stereoisomerism. The isomerism due to the difference in spatial arrangements of groups about the doubly bonded carbon atoms is known as Geometrical Isomerism.

When two similar atoms or groups lie on the same side, the isomerism is called cis isomerism and the isomers are called cis isomers (cis means "on same side" in Latin). When two similar atoms or groups lie on opposite sides, the isomerism is called trans isomerism and the isomers are called trans isomers (trans means "across" in Latin). Geometrical isomerism is also called Cis-trans isomerism.

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