What is Para Dichlorobenzene Definition Preparation Reactions and Uses
Paradichlorobenzene is a chlorinated fragrant hydrocarbon. This fumigant repellent and insecticide is suitable for controlling cloth moths. Para dichlorobenzene is also used in different deodorant slabs manufactured for toilets and refuse cans. So, what is paradichlorobenzene exactly? It is also known as 1, 4-dichlorobenzene. In the United States, it was registered for the very first time in 1942.
According to the World Health Organization, Paradichlorobenzene is carcinogenic, which means it has the possibility of causing cancer in humans. While children might be specifically sensitive to this compound in comparison to the adults. Currently, no data is suggesting increased Paradichlorobenzene Sensitivity in children. It is also worth noting that Paradichlorobenzene does not have any effect on the environment. This is because it quickly transforms into vapour if it gets into the atmosphere.
What is Para Dichlorobenzene in a More Detailed Form?
Para Dichlorobenzene transforms from solid to gas directly, and this entire procedure is known as sublimation. Target organisms of this aromatic compound are insects, mould and mildews. However, it is to be noted that ParaDichlorobenzene can be toxic as well. It is majorly used in pesticide products but is available in airtight bottles or containers to avoid toxicity.
Para Dichlorobenzene forms several azeotropic blends. Its other popular names are para crystals, paracide and 1 4-dichlorobenzene. Major concentrations of 1, 4-dichlorobenzene are given out in the general atmosphere and are present in the form of vapour. Para Dichlorobenzene does not appear naturally.
The Right Paradichlorobenzene Definition will be:
“A crystalline compound in white (C6H4Cl2) made through the chlorination of benzene and specifically used in the form of a deodorizer and moth repellent.”
Paradichlorobenzene Uses
Some of the most widespread uses of Paradichlorobenzene Include:
You can use it in the form of a space deodorizer for refuse containers and toilets. Paradichlorobenzene is also used as a fumigant for controlling mildews, moths and moulds.
You can even use Paradichlorobenzene for controlling different tree-boring ants and insects. The compound is also suitable for controlling blue mould in tobacco seedbeds.
Paradichlorobenzene, when used in the form of a disintegrating paste works fine in moulding stoneware and concrete. It can even be used as a lubricant and in manufacturing pharmaceuticals, dyes and plastics.
Paradichlorobenzene Structure
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The structure of Paradichlorobenzene is C6H4Cl2. What is the melting point of Paradichlorobenzene? It is 53.1 degrees C. now, here the question arises, why the melting point of Paradichlorobenzene is higher in comparison to O dichlorobenzene. The answer to this question is because Paradichlorobenzene happens to be more symmetrical in comparison to m and o isomers; hence it fits closely in any crystal lattice than is the case with m and o isomers. It is only because of this reason that extra energy is needed for breaking Paradichlorobenzene crystal lattice. And this is the main reason why the melting point of Paradichlorobenzene is higher than m and o isomers.
Physical Properties of Para Dichlorobenzene – C6H4Cl2
The physical properties of Para Dichlorobenzene are:
Mothball-lie odour
White liquid appearance
Water solubility: 0.08g/L (80 mg/L) at 25 degree C
Vapour pressure: 1.3 mmHg
Gravity: 1.24 g/mL
Chemical Properties of Para Dichlorobenzene – C6H4Cl2
The chemical properties of Para Dichlorobenzene are:
When chlorinated, Paradichlorobenzene principally yields 1, 2, 4-trichlorobenzene. Paradichlorobenzene can even be sulfonated or nitrated, but the products gained, so do not have any technical significance.
The products formed from Paradichlorobenzene reaction with OH radicals or ozone in the environment are ring cleavage elements, nitro compounds and chlorinated phenols.
The manufacturers generally emphasize the production of dichlorobenzene or more largely chlorinated derivatives. But generally have the potential of producing only those derivatives that are in huge demand.
Understanding the Different Products Containing Paradichlorobenzene
Different varieties of mothballs contain Paradichlorobenzene. These are solids and can transform into toxic gases that help in killing moths. Paradichlorobenzene vapour is highly toxic for ants and insects. The compound breaks down in the body of an animal or a human to form various other compounds that might harm the organs or the cells. The liver is one of the most affected organs if Paradichlorobenzene happens to enter the human or animal body.
Paradichlorobenzene Exposure
Any individual or animal can be exposed to Paradichlorobenzene if they happen to breathe it in or get in contact with it through the skin. Individuals and animals can even drink and eat something containing Paradichlorobenzene accidentally. This generally happens when they get something on their hands and do not wash them before smoking or eating. Human beings have the major risk of being exposed to Paradichlorobenzene by breathing in its vapours. Smelling mothballs means inhaling the pesticide. Pets and small children might be at the risk of consuming mothballs mainly because they appear as candies and treats.
FAQs on Para Dichlorobenzene Structure Properties and Applications
1. What is para dichlorobenzene?
**Para dichlorobenzene** is an aromatic organic compound with the molecular formula C6H4Cl2 in which two chlorine atoms are attached to a benzene ring at the para (1,4) positions. It is also called 1,4-dichlorobenzene.
- Belongs to the class of halogenated aromatic hydrocarbons.
- White crystalline solid with a strong odor.
- Commonly used in mothballs, deodorizer blocks, and pest control products.
2. What is the chemical formula of para dichlorobenzene?
The chemical formula of para dichlorobenzene is C6H4Cl2.
- It contains 6 carbon atoms, 4 hydrogen atoms, and 2 chlorine atoms.
- The structure is derived from benzene (C6H6) by replacing two hydrogen atoms with chlorine atoms.
- The chlorines are positioned opposite each other on the benzene ring (1,4-positions).
3. What does “para” mean in para dichlorobenzene?
In para dichlorobenzene, “para” means the two substituents are located at the 1,4-positions on the benzene ring.
- Benzene derivatives use ortho (1,2), meta (1,3), and para (1,4) to describe relative positions.
- In the para isomer, the chlorine atoms are opposite each other.
- This positional difference leads to different physical properties compared to ortho- and meta-dichlorobenzene.
4. What are the isomers of dichlorobenzene?
The three isomers of dichlorobenzene are ortho-dichlorobenzene (1,2-), meta-dichlorobenzene (1,3-), and para-dichlorobenzene (1,4-).
- All have the same molecular formula C6H4Cl2.
- They differ in the relative positions of chlorine atoms on the benzene ring.
- These are examples of positional isomers.
5. How is para dichlorobenzene prepared?
Para dichlorobenzene is prepared by the electrophilic substitution chlorination of benzene. The balanced reaction is: C6H6(l) + Cl2(g) → C6H5Cl(l) + HCl(g), followed by further chlorination to form dichlorobenzenes.
- Reaction occurs in the presence of a Lewis acid catalyst such as FeCl3.
- A mixture of ortho, meta, and para isomers is formed.
- Para dichlorobenzene is separated by fractional crystallization due to its higher melting point.
6. What are the physical properties of para dichlorobenzene?
Para dichlorobenzene is a white crystalline solid with a strong odor and a relatively high melting point.
- Molecular formula: C6H4Cl2
- Melting point: about 53°C
- Boiling point: about 174°C
- Insoluble in water but soluble in organic solvents like ethanol and ether.
7. What are the uses of para dichlorobenzene?
Para dichlorobenzene is mainly used as a moth repellent and deodorizer.
- Active ingredient in many mothballs and pest control products.
- Used in air fresheners and toilet deodorizer blocks.
- Intermediate in the manufacture of dyes and resins.
8. Why does para dichlorobenzene have a higher melting point than ortho and meta isomers?
Para dichlorobenzene has a higher melting point because its symmetrical 1,4-structure allows better crystal packing.
- Symmetry increases intermolecular attractions in the solid state.
- Stronger van der Waals forces lead to a more stable crystal lattice.
- Ortho and meta isomers are less symmetrical, resulting in lower melting points.
9. Is para dichlorobenzene soluble in water?
Para dichlorobenzene is practically insoluble in water because it is a nonpolar aromatic compound.
- Water is a polar solvent, and “like dissolves like” applies.
- The molecule lacks strong hydrogen bonding capability.
- It dissolves better in nonpolar organic solvents such as benzene and ether.
10. What type of compound is para dichlorobenzene?
Para dichlorobenzene is a halogenated aromatic hydrocarbon and specifically an aryl halide.
- Contains a benzene ring (aromatic system).
- Two chlorine atoms are directly bonded to the aromatic ring.
- Exhibits typical reactions of aromatic compounds such as electrophilic substitution.
