C2H2Br2 C2H2Br2
Top view down 2 axis Side view

The trans isomer of E-1,2-dibromoethylene has a single mirror plane with a twofold rotation axis perpendicular to it. It has also a point of inversion. You should compare the symetry of this molecule to that of the cis isomer of 1,2-dichloroethylene.

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

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