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Explain the method of writing E-Z config...

Explain the method of writing `E-Z` configurations for geometrical isomers taking `CHCl - CFBr` as your example.

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The `E-Z` configuration system for geometrical isomers is based on atomic number ranking method. According to this when atoms of higher atomic number are on the same side of the double bond, the double bond is said to have Z - configuration. When atoms of higher atomic number are one opposite sides of the double bond it is said to have E - configuration.
Ex : `CHCl = CFBr`
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