General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 9, Problem 9.46P
Interpretation Introduction

Interpretation:

The cis and trans isomer of 1,2-dichloro-1,2-dibromo ethene has to be drawn.

Concept Introduction:

ISOMERS:

The molecules, which have the same molecular formula but different arrangement of atom, are called as isomers.  There are two types of isomers,

  • Structural isomers
  • Stereo isomers

Stereo isomers:

Stereo isomers are the isomers that have same molecular formula but differ in spatial arrangement of atoms.  Stereo isomers can be sub divided into two groups

  • Optical isomers
  • Geometric isomers

Optical isomers:

Optical isomers are the mirror image of a molecule and they can be rotated by plane polarized light.

Geometric isomers:

If there is restricted rotation in a molecule there arises geometric isomerism.  Geometric isomers are also known as Cis- Trans isomerism.

  • If the two atoms locked in same side of the molecule then it is called as cis isomers.
  • If the two atoms locked in opposite side of the molecule then it is called as trans isomers.

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