Isomers Section 1.1 and 1.2.

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Presentation transcript:

Isomers Section 1.1 and 1.2

Structural Isomerism Structural Isomerism When two molecules each have the same numbers and types of atoms but these atoms are bonded in different ways Ex: There are 2 alkanes that have the molecular formula C4H10

Isomerism

Cis- Trans Isomerism Stereoisomers Have the same kind and number of atoms bonded in the same order but have different arrangements in space. They are distinct compounds with different properties. They must have a double bond. These two pentene structures represent two different compounds because the molecule cannot rotate around the double bond.

Cis Vs. Trans Cis-Isomer Trans-Isomer Has matching alkyl groups located on the same side of the double bond Trans-Isomer Has the groups located on opposite sides of the double bond

Practice 1. Name the following stereoisomer Cis-pent-2-ene Trans-pent-2-ene 2. Draw structural formulas for cis-1,2-dichloroethene and trans-1,2-dichloroethene