C2H2Cl2 C2H2Cl2
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The cis isomer of Z-1,2-dichloroethylene has two mirror planes and one twofold rotation axis along the line formed by the intersection of the two planes. You should compare the symetry of this molecule to that of the trans isomer of 1,2-dibromoethylene.

The point-group symmetry for this molecule is given the crystallographic symbol m m 2.

© Copyright 1997-2006.  Birkbeck College, University of London. Author(s): Jeremy Karl Cockcroft