Quick Answer: Why Are They Called Aromatic Hydrocarbons?

What are aromatic hydrocarbons used for?

Examples of aromatic hydrocarbons include benzene, toluene, purines and pyrimidines.

Aromatic hydrocarbons occur naturally in DNA and in chlorophyll.

They also are used by humans to make plastic, medicine, dyes and paint thinner..

What is an example of an aromatic hydrocarbon?

Aromatic Hydrocarbons are especially stable, unsaturated cyclic compounds made primarily of hydrogen and carbon atoms. … The electrons that create the double bonds are delocalized and can move between parent atoms. Examples of aromatic hydrocarbons include benzene, toluene, purines and pyrimidines.

What is another name for aromatic hydrocarbon?

An aromatic hydrocarbon or arene (or sometimes aryl hydrocarbon) is a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming a circle. In contrast, aliphatic hydrocarbons lack this delocalization.

What are the main sources of aromatic hydrocarbons?

Simple aromatic hydrocarbons come from two main sources: Coal and petroleum. Coal is a complex mixture of a large number of compounds, most of which are long-chain compounds. If coal is heated to about 1000 °C in the absence of air (oxygen), volatile components, the so-called tar oil, are stripped out.

Do hydrocarbons cause cancer?

Polycyclic aromatic hydrocarbons (PAHs) are made whenever substances are burned. PAHs are also found at former coal-gasification sites. Breathing smoke or coming into contact with contaminated soil exposes people to PAHs. Some PAHs may cause cancer and may affect the eyes, kidneys, and liver.

What is the most important aromatic compound?

BenzeneBenzene (C6H6) is the best-known aromatic compound and the parent to which numerous other aromatic compounds are related. The six carbons of benzene are joined in a ring, having the planar geometry of a regular hexagon in which all of the C—C bond distances are equal.

Why are aromatic hydrocarbons dangerous?

Polycyclic aromatic hydrocarbons (PAHs) are made whenever substances are burned. PAHs are also found at former coal-gasification sites. Breathing smoke or coming into contact with contaminated soil exposes people to PAHs. Some PAHs may cause cancer and may affect the eyes, kidneys, and liver.

What is PAH stand for?

PAHAcronymDefinitionPAHPolycyclic Aromatic Hydrocarbon (compound)PAHPulmonary Arterial HypertensionPAHPoly (Allylamine Hydrochloride)PAHPolska Akcja Humanitarna29 more rows

How do hydrocarbons affect human health?

Many are not harmful unless the oily liquid gets into the lungs. … However, if it enters the lungs, it can cause a pneumonia-like condition; irreversible, permanent lung damage; and even death. Some hydrocarbons can cause other effects, including coma, seizures, irregular heart rhythms or damage to the kidneys or liver.

Which of the following are aromatic hydrocarbons?

Polycyclic Aromatic HydrocarbonsThese are the hydrocarbons which comprise of aromatic rings in fused form. … One common example of these polycyclic hydrocarbons is naphthalene. … Some of the examples of aromatic hydrocarbons are Methylbenzene, Naphthalene, Phenanthrene, Trinitrotoluene, and o-dihydroxybenzene.

What is the meaning of aromatic hydrocarbon?

An aromatic hydrocarbon or arene (or sometimes aryl hydrocarbon) is a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming a circle. … The configuration of six carbon atoms in aromatic compounds is called a “benzene ring”, after the simplest possible such hydrocarbon, benzene.

Why is benzene called aromatic hydrocarbons?

Benzene is an aromatic hydrocarbon because it obeys Hückel’s rule. Originally, benzene was considered aromatic because of its smell: it has an “aromatic” odor. It is now considered aromatic because it obeys Hückel’s rule: … In the case of benzene, we have 3 π bonds (6 electrons), so 4n+2=6 .

Is Cyclooctatetraene aromatic or not?

In terms of the aromaticity criteria described earlier , cyclooctatetraene is not aromatic since it fails to satisfy the 4n + 2 π electron Huckel rule (i.e. it doesn’t have an odd number of π electron pairs). It is actually an example of a 4n π electron system (i.e. an even number of π electron pairs).

How are PAHs formed?

Polycyclic aromatic hydrocarbons (PAHs) are a class of chemicals that occur naturally in coal, crude oil, and gasoline. They also are produced when coal, oil, gas, wood, garbage, and tobacco are burned. PAHs generated from these sources can bind to or form small particles in the air.

What is the general formula of aromatic hydrocarbon?

The aromatic hydrocarbons are “unsaturated hydrocarbons which have one or more planar six-carbon rings called benzene rings, to which hydrogen atoms are attached with the general formula CnHn“. Many aromatic hydrocarbons contain a benzene ring (also referred to as an aromatic ring).

What is the functional group of aromatic hydrocarbons?

An aromatic functional group or other substituent is called an aryl group. The earliest use of the term aromatic was in an article by August Wilhelm Hofmann in 1855. Hofmann used the term for a class of benzene compounds, many of which have odors (aromas), unlike pure saturated hydrocarbons.

How do you identify aromatic hydrocarbons?

For a compound to be considered aromatic, it must be flat, cyclic, and conjugated and it must obey Huckel’s rule. Huckel’s rule states that an aromatic compound must have pi electrons in the overlapping p orbitals in order to be aromatic (n in this formula represents any integer).