definition of aromatic hydrocarbons

Polynuclear Aromatic Hydrocarbons and their Toxicity - 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 ma..

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 co..

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..

. (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..

Compounds containing only carbon and hydrogen are called hydrocarbons. The simplest organic compounds are the compounds of carbon and hydrogen only. There are two classes of hydrocarbons, * Aliphatic hydrocarbons * Aromatic hydrocarbons..

From Hydrocarbons - (i) By ozonolysis of alkenes Alkenes react with ozone to form ozonides which on subsequent reductive cleavage with zinc dust and water or H 2 /Pd give aldehydes, Ketones or a mixture of both depending on the substitution pattern of the alkene. (ii) By hydration of alky..

Introduction - The simplest organic compounds are hydrocarbons. All organic compounds can be derived from hydrocarbons by substituting a hydrogen atom with a suitable functional group. Replacing a hydrogen atom by a OH group in a hydrocarbon, gives an alcohol: replacem..