Para dichlorobenzene - C6H4Cl2

What is Para dichlorobenzene?

Para dichlorobenzene is a chlorine substituted organic compound with the chemical formula C6H4Cl2.

Para dichlorobenzene is an aromatic compound that forms a number of azeotropic mixtures. Para dichlorobenzene is usually called 1,4-dichloro benzene and is also called para crystals and paracide. Most of the 1,4-dichlorobenzene released into the general environment is present as a vapour. It does not occur naturally.

Other names – 1,4-Dichlorobenzene

Table of Contents

C6H4Cl2 Para dichlorobenzene
Density 1.25 g/cm3
Molecular Weight/ Molar Mass 147.01
Boiling Point 174 °C
Melting Point 53.5 °C
Chemical Formula C6H4(Cl)2

Para dichlorobenzene Structure – C6H4Cl2

Para dichlorobenzene C6H4Cl2

Physical Properties of Para dichlorobenzene – C6H4Cl2

Odour Mothball-like
Appearance White coloured 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, moulds and mildews.
  • Used in the control of certain tree-boring insects and ants in the control of blue mould tobacco seedbeds.
  • Used as a disintegrating paste for moulding concrete and stoneware as a lubricant and in the manufacture of plastics, dyes and pharmaceuticals.

Frequently Asked Questions


What is dichlorobenzene used for?

Paradichlorobenzene is a fumigant insecticide used to combat moths in clothing. It can also be used in deodorant blocks made for toilets and trash cans. Paradichlorobenzene was first licensed in the United States for use in 1942 and is often referred to as 1,4-dichlorobenzene.


What does Paradichlorobenzene smell like?

Paradichlorobenzene is a solid crystal which is colourless to white and has a heavy pungent scent. At room temperatures, it can sublimate, transforming directly from a solid into a gas.


Is Para dichlorobenzene polar or non polar?

P-Dichlorobenzene is symmetrical, and is thus non-polar. But o-dichlorobenzene and m-dichlorobenzene would be polar molecules, due to the polar nature of the C-Cl bond.


Is P-dichlorobenzene soluble in water?

P-dichlorobenzene, with the smell of mothballs appears as a white-coloured liquid. Water is denser than water and water-insoluble.


What do polar and non-polar mean?

Polar molecules arise when there is an electronegativity difference between the bonded atoms. Nonpolar molecules arise when electrons are exchanged equally between atoms of a diatomic molecule or when polar bonds cancel each other out in a larger molecule.

Test your knowledge on para dichlorobenzene


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