Allene
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An Allene is an hydrocarbon in which one atom of carbon is connected by double bonds with two other atoms of carbon. The simplest allene is propyl allene:
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Propyl_allene.png
image:propyl_allene.png
Such pair of bonds make allene much more reactive than other alkenes. For example their reactivity with gaseous chlorine is more like reactivity of alkynes than other alkenes.
An allene with groups "a" and "b" replacing the hydrogens on the left and right side of the image will be chiral as long as "a" does not equal "b". This is due to the two sets of groups being perpendicular to each other, and thus there is no mirror plane in the molecule.
A synonym for this compound is 1,2-propadiene.fr:Allène ja:アレン pl:Allen