What do you understand about geometrical isomerism? Explain the geometrical isomers of 2 - butene .

Explanation

Geometrical isomerism ariese due to a difference in the arrangement of atoms or group around doubly bonded carbon atoms. 2- Butene has the following two structures.

The isomers in which same groups of atoms are on the same side of the `C=C` is called cis - isomer while the isomer having same groups of atoms on the opposite sides of the `C=C` is called trans - isomer.In Cis - 2- Butene the two methyl group are on one side while the two hydrogen atoms are on other side. In trans - 2 butene two methyl groups and two hydrogen atoms are present opposite to the double bond.