Main Page | See live article | Alphabetical index In chemistry, a double bond in which the greater radical on both ends is on the opposite side of the bond is called trans. Compare with cis. In the diagram on the right, the hydrogen atoms are on opposite sides of the double bond. They cannot rotate to the same side of the molecule, as (unlike with a single bond) double bonds prevent this happening. See Geometric isomerism for more on this topic. See also: Trans fat This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.