Para dichlorobenzene - C6H4Cl2

What is Para dichlorobenzene?

Para dichlorobenzene is a chlorine substituted organic compound with the chemical formula C6H4Cl2. It is an aromatic compound forms a number of azeotropic mixtures. Para dichlorobenzene is usually called 1,4-dichloro benzene and also called as para crystals and paracide. Most of the 1,4-dichlorobenzene is released to the general environment is present as a vapour. It does not occur naturally.

Other names – 1,4-Dichlorobenzene


Para dichlorobenzene


1.25 g/cm3

Molecular Weight/ Molar Mass


Boiling Point

174 °C

Melting Point

53.5 °C

Chemical Formula


Para dichlorobenzene Structure – C6H4Cl2

Para Dichlorobenzene

Physical Properties of Para dichlorobenzene – C6H4Cl2




White colored liquid

Experimental vapour pressure

1.3 mmHg

Experimental gravity

1.248 g/mL

Solubility in water

0.08 g/L (80 mg/L) at 25 °C

Chemical Properties of Para dichlorobenzene – C6H4Cl2

  • Chlorination of p-dichlorobenzene yields principally 1,2,4-trichlorobenzene. It may also be nitrated or sulfonated but the products are of little technical importance
  • Anticipated products from the reaction of 1,4-dichlorobenzene with ozone or OH radicals in the atmosphere are chlorinated phenols, ring cleavage products and nitro compounds..
  • Producers tend to emphasize dichlorobenzene production or more highly chlorinated derivatives but usually have the capability to produce whichever derivative is in demand.

Uses of Para dichlorobenzene – C6H4Cl2

  • Used as a space deodorant for toilets and refuse containers and as a fumigant for control of moths, molds and mildews.
  • Used in the control of certain tree-boring insects and ants in the control of blue mold tobacco seedbeds.
  • Used as a disintegrating paste for molding concrete and stoneware as a lubricant and in the manufacture of plastics, dyes and pharmaceuticals.

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