Trans-1,2-dibromoethene. Computer illustration of a molecule of trans-1,2-dibromoethene (formula: C2H2Br2). The atoms are represented as cylinders, and are colour-coded: carbon (yellow), hydrogen (white) and bromine (red). This molecule is displaying trans isomerism. The bromine atoms can either be opposite each other (as here), or adjacent to each other (the cis form). As the bond between the two carbon atoms cannot rotate, a molecule cannot alternate between the two forms. See image A700/140 for a molecule of the cis form.
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