What Are The Properties Of Aromatic Hydrocarbon?

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..

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 is an aldehyde functional group?

Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O. The carbon atom of this group has two remaining bonds that may be occupied by hydrogen or alkyl or aryl substituents. If at least one of these substituents is hydrogen, the compound is an aldehyde.

What are the common aromatic hydrocarbon and their importance?

Aromatic hydrocarbons are especially stable because they are both cyclic and unsaturated. 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.

Why are they called aromatic hydrocarbons?

Aromatic compounds, originally named because of their fragrant properties, are unsaturated hydrocarbon ring structures that exhibit special properties, including unusual stability, due to their aromaticity. They are often represented as resonance structures containing single and double bonds.

What is meant by aromatic hydrocarbon?

Aromatic hydrocarbons are a special class of unsaturated hydrocarbon based on a six carbon ring moiety called benzene. The saturated hydrocarbon cyclohexane is transformed into the aromatic hydrocarbon benzene by adding three alternating carbon–carbon double bonds, as shown in Fig.

What is the role of aromatic compounds in the human life?

Aromaticity is important because it makes molecules more stable. Aromatic compounds play important roles in biochemistry and in industry. Amino acids are the building blocks of proteins. Four of them — histidine, phenylalanine, tyrosine, and tryptophan — are aromatic.

Why are aromatic compounds more stable?

15.1: Aromatic Compounds Are Unusually Stable. Because of the low hydrogen to carbon ratio in aromatic compounds (note that the H:C ratio in an alkane is >2), chemists expected their structural formulas would contain a large number of double or triple bonds.

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).

What is PAH stand for?

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

What are halogenated aromatic hydrocarbons?

The halogenated aromatic hydrocarbons are chemicals which contain one or more atoms of a halogen (chloride, fluoride, bromide, iodide) and a benzene ring.

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.

Why are aromatic compounds important?

Aromaticity is important because it makes molecules more stable. Aromatic compounds play important roles in biochemistry and in industry. Amino acids are the building blocks of proteins. Four of them — histidine, phenylalanine, tyrosine, and tryptophan — are aromatic.

What are examples of aromatic hydrocarbons?

Aromatic hydrocarbons are especially stable because they are both cyclic and unsaturated. 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 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.

What are the principal sources of aliphatic hydrocarbons?

Aliphatic (from Greek aleiphar, “fat”) hydrocarbons derive from the chemical breakdown of fats or oils. They are divided into alkanes, alkenes, and alkynes. Alkanes have only single bonds, alkenes contain a carbon-carbon double bond, and alkynes contain a carbon-carbon triple bond.

What structure do all aromatic hydrocarbons have in common?

Aromatic compounds are ring structures with unusual stability due to delocalized pi electron density that is shared between all of the carbon atoms in the ring.

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.

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.

What is aromatic content?

Aromatics (content) Aromatics are hydrocarbons containing a benzene ring of six unsaturated carbon atoms. Benzene is the the smallest, most basic aromatic compound, but other common ones include toluene and xylene. Aromatics in petroleum products.

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).

Where are aromatic hydrocarbons found?

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.

Which of the following is aromatic hydrocarbon?

Polycyclic Aromatic Hydrocarbons These compounds are said to be pollutants. Some of the examples of aromatic hydrocarbons are Methylbenzene, Naphthalene, Phenanthrene, Trinitrotoluene, and o-dihydroxybenzene.

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 the functional group of COOH?

A carboxyl group (COOH) is a functional group consisting of a carbonyl group (C=O) with a hydroxyl group (O-H) attached to the same carbon atom.

What is the difference between aromatic and aliphatic hydrocarbons?

In aliphatic compounds the Carbon compounds are linked to each other in a straight chain manner. In aromatic compounds the Carbon compounds are linked to each other in ring structure manner with conjugated pi electrons.