Application
cis-trans
2 substituents only
• Determining the positions of the H atoms attached to the carbon atoms
• Cis isomer has higher bp when hydrogen bonding between functional groups enabled by close proximity
E/Z
4 substituents
• Determining the positions of the “higher-priority” groups
• Higher priority groups on each side are determined by:
1. Atomic number of the atom directly attached to the double bond carbon
2. If the first atom on both substituents are identical in atomic number then move along the substituent chains until the first point of difference
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