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Wiktionary
dichlorobenzene

n. (context organic compound English) Either of three isomeric derivatives of benzene in which two hydrogen atoms have been replaced by chlorine; they are used as solvents and in organic synthesis

Wikipedia
Dichlorobenzene

There are three distinct chemical compounds which are dichlorobenzenes:

  • 1,2-Dichlorobenzene or ortho-dichlorobenzene;
  • 1,3-Dichlorobenzene or meta-dichlorobenzene;
  • 1,4-Dichlorobenzene or para-dichlorobenzene.