sources of aromatic hydrocarbons

Aromatic compounds from coal - Coal is a complex mixture of hydrocarbons. It also contains some organic compounds containing nitrogen and sulphur in small amounts. It can be approximated to the formula (C 3 H 4 ) n . Coal is a hydrogen-deficient substance. It is assumed that the..

Until the early years of the nineteenth century, only the plants and animals were the known sources of organic compounds. With the advent of the Industrial Revolution in Europe, fossil fuels like coal and petroleum gained prominence as the sources of organic compounds, particula..

Polynuclear aromatic hydrocarbons are a class of compounds found throughout the environment in the air, in the soil and in the water. They are found naturally in crude oil, coal tar, and coal. They are man-made during incomplete combustion of hydrocarbons like coal, oi..

toluene o-xylene m-xylene p-xylene Methylbenzene 1,2-dimethylbenzene 1,3-dimethylbenzene 1,4-dimethylbenzene ..

These are compounds containing carbon and hydrogen only. The hydrocarbons involved in air pollution are gases (or those that are volatile) under ordinary conditions. The important sources of hydrocarbons in the natural environment are bacterial decomposition of o..

. (iii) By oxidation of methylbenzenes Oxidation of an aromatic compound leaving a methyl group at the benzene ring with CrO 3 in the presence of acetic anhydride followed by hydrolysis gives the corresponding benzaldehyd..

A hydrocarbon is the name given to the mixture of gases caused by the incomplete combustion of fossil fuels. These comprise of paraffins, olefines and aromatics that are emitted from petroleum refineries. Some of these substances are suspected carcinogens, such as the polynucle..

Direct chlorination or bromination of benzene or other aromatic hydrocarbon gives chloroarenes and bromoarenes. These reactions are carried out in the presence of Lewis acids such as ferric or aluminium halides (FeCl 3 , FeBr 3 , AlCl 3 ) in the dark, at ordinary temperatures..

Aromatic compounds are those, which resemble benzene in chemical behavior. These compounds contain alternate double and single bonds in a cyclic structure. They undergo substitution reactions rather than addition reactions. This characteristic behavior is called aromatic charac..

Introduction - Man's quest for sources of energy is inexhaustible. Early man depended mainly on muscular energy and later began to use wind and flowing water as sources of energy. He learned the art of making and controlling fire. Fire became his source of light at nig..