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Organic chemistry
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cis vs trans alkenes
Geometric Isomers
The E/Z naming system
E -entgegen, opposite sides Z - zusammen, together on the same side
Ranking Priorities: Cahn-Ingold-Prelog Rules
Must rank atoms that are connected at comparison point
Higher atomic number gets higher priority
Br > Cl > O > N > C > H
In this case, the higher priority groups are opposite: (E )-2-bromo-2-chloro-propene
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If atomic numbers are the same, compare the next connection point at same distance
Compare until you get the higher atomic number
Extended Comparison
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Dealing With Multiple Bonds