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Example:
1-butene and 2-butene have the same molecular
formula, C4H8, but structurally they are
different because of the different positions of the

                                             double bond.

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 Types of isomer:
 I-Constitutional (Structural) isomers.
 II- Stereoisomers.

  Types of Stereoisomers:
  A-Conformational isomers:
  B-Configurational isomers:
  Configurational isomers include:
  •Enantiomers
  •Optical isomers
  •Diastereomers
  •Geometrical isomers

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