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Aliphatic hydrocarbons are composed of catenated carbon chain. In acyclic compounds, the carbon chain are straight or branched. Important families that belong to this group are the alkanes, alkenes, and alkynes (homologous series) with members (homologue) examples like {methane ethane}, {ethene and propene} and {ethyne and propyne} respectively. These members are d first two members of each of the families mention above. In cyclic aliphatic compounds, the end carbon atoms of an acyclic carbon chain join together to form a ring. Example of such compounds are {cyclo propane, cyclo butane}, {cyclo propene, cyclo butene}, and {cyclo propyne and cyclo butyne}, respectively.  

Aliphatic hydrocarbons are composed of catenated carbon chain. In acyclic compounds, the carbon chain are straight or branched. Important families that belong to this group are the alkanes, alkenes, and alkynes (homologous series) with members (homologue) examples like {methane ethane}, {ethene and propene} and {ethyne and propyne} respectively. These members are d first two members of each of the families mention above. In cyclic aliphatic compounds, the end carbon atoms of an acyclic carbon chain join together to form a ring. Example of such compounds are {cyclo propane, cyclo butane}, {cyclo propene, cyclo butene}, and {cyclo propyne and cyclo butyne}, respectively.  

Aromatic hydrocarbons are all cyclic compounds. The basic cyclic structure is the benzene ring. The are compounds that obey the system of delocalized electron. The have alternating double bonds and are stable. Due to their stability, they will not undergo addition reaction. [[w:Michael Faraday|Michael Faraday]] was the first scientist to discover benzene while [[w:August Kekulé|August Kekulé]] devised the structure. Benzene as form the major building block of all aromatic compounds. Example of such aromatic hydrocarbons include benzene, cyclobutadiene, cyclooctatetraene etc.

Aromatic hydrocarbons are all cyclic compounds. The basic cyclic structure is the benzene ring. The are compounds that obey the system of delocalized electron. The have alternating double bonds and are stable. Due to their stability, they will not undergo addition reaction. [[w:Michael Faraday|Michael Faraday]] was the first scientist to discover benzene, while [[w:August Kekulé|August Kekulé]] devised the structure. Benzene as form the major building block of all aromatic compounds. Example of such aromatic hydrocarbons include benzene, cyclobutadiene, cyclooctatetraene etc.

==Sources of hydrocarbons==

==Sources of hydrocarbons==

The natural sources of hydrocarbons include [[coal]], petroleum and natural gas. These are often known as fossile fuel because they are the remains of animals and plants which are dead long millions years ago, this remains has become deposited and transformed into sediment as a result of the great heat and pressure in the earth [[crust]]. They are used as fuels, that is burnt to release heat and other forms of energy. Coal is a solid fuel, petroleum is a dark and viscous liquid fuel, otherwise called crude oil. While natural gas is a gaseous fuel.

The natural sources of hydrocarbons include [[coal]], petroleum, and natural gas. These are often known as fossil fuels because they are the remains of animals and plants which died millions of years ago; their remains have become deposited and transformed into sediment as a result of the great heat and pressure in the earth's [[crust]]. They are used as fuels, burnt to release heat and other forms of energy. Coal is a solid fuel, petroleum is a dark and viscous liquid fuel (otherwise called crude oil), and natural gas is a gaseous fuel.

==Alkanes, alkenes, and alkynes==

==Alkanes, alkenes, and alkynes==