Dichloroethene or Dichloroethylene, often abbreviated as DCE, can refer to any one of several isomeric forms of the organochloride with the molecular formula C₂H₂Cl₂:

There are three isomers:

• 1,1-Dichloroethene
• 1,2-Dichloroethene (cis and trans)

Dichloroethene should not be confused with dichloroethane which is often abbreviated as DCA.

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