What are the main sources of aromatic hydrocarbons?

HomeWhat are the main sources of aromatic hydrocarbons?

What are the main sources of aromatic hydrocarbons?

The term HYDROCARBONS means organic compounds which contain only carbon and hydrogen. By using this definition, four classes of hydrocarbons are included: alkanes, alkenes, alkynes and aromatic. SATURATED means that each carbon is bonded to four other atoms through single covalent bonds.

Hydrocarbon, any of a class of organic chemical compounds composed only of the elements carbon (C) and hydrogen (H). … The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.

Q. Who discarded vital force theory?

Friedrich Wohler

Q. What are the types of hydrocarbon?

Hydrocarbons themselves are separated into two types: aliphatic hydrocarbons and aromatic hydrocarbons. Aliphatic hydrocarbons are hydrocarbons based on chains of C atoms. There are three types of aliphatic hydrocarbons. Alkanes are aliphatic hydrocarbons with only single covalent bonds.

Q. What are hydrocarbon How will you classify them with example?

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.

Q. What is hackle rule?

In 1931, German chemist and physicist Erich Hückel proposed a rule to determine if a planar ring molecule would have aromatic properties. This rule states that if a cyclic, planar molecule has 4n+2π electrons, it is aromatic. This rule would come to be known as Hückel’s Rule.

Q. 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.

Q. Why are aromatic hydrocarbons dangerous?

Long-term health effects of exposure to PAHs may include cataracts, kidney and liver damage, and jaundice. Repeated skin contact to the PAH naphthalene can result in redness and inflammation of the skin. Breathing or swallowing large amounts of naphthalene can cause the breakdown of red blood cells.

Q. What is the difference between polynuclear and polycyclic aromatic hydrocarbons?

D. A polynuclear aromatic hydrocarbon is a hydrocarbon made up of fused aromatic ring molecules. … Another way to consider PAHs is molecules made by fusing two or more benzene rings. Polynuclear aromatic hydrocarbon molecules contain only carbon and hydrogen atoms.

Q. Are aromatic hydrocarbons toxic?

Polycyclic aromatic hydrocarbons (PAHs) are widespread across the globe mainly due to long-term anthropogenic sources of pollution. … PAH pollutants have been determined to be highly toxic, mutagenic, carcinogenic, teratogenic, and immunotoxicogenic to various life forms.

Q. Why are PAHs carcinogenic?

PAHs are ubiquitous group of potent environmental pollutants that consist of 2 to 7 fused aromatic rings. … Among these PAHs, benzo[a]pyrene (BaP) is the best characterized carcinogen. It is metabolized via cytochrome P450 enzymes to intermediates or metabolites, which can then bind to DNA and form DNA adducts [13, 14].

Q. Is PAHs carcinogenic?

Evidence indicates that mixtures of PAHs are carcinogenic to humans. The evidence comes primarily from occupational studies of workers exposed to mixtures containing PAHs. Such long-term studies have shown an increased risk of predominantly skin and lung as well as bladder and gastrointestinal cancers.

Q. Where are PAHs 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.

Q. Which is the simplest example of polynuclear hydrocarbons?

naphthalene

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