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Stereoisomeric olefins, cycloalkanes, etc. which differ in the positions of groups relative to a reference plane: in the cis-isomer the atoms are on the same side, in the trans-isomer they are on opposite sides. An obsolete synonym, for which the usage is strongly discouraged, is geometric isomerism.
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Why is cis-1,2-dichloroethene more stable than trans-1,2-dichloroethene?
Why is cis-1,2-dichloroethene more stable than trans-1,2-dichloroethene?
Usually, trans compunds are more stable than cis ones, due to less strain and its non-polarity. But, in this case it's qui …