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'''Unsaturated compound''' refers to a [[chemical compound]] that contains at least one [[carbon-carbon double bond]] (C=C) or [[carbon-carbon triple bond]] (C≡C) in its [[molecule]]. These compounds are a major class of [[organic compounds]] and are contrasted with [[saturated compounds]], which have only single bonds between carbon atoms. Unsaturated compounds include, but are not limited to, [[alkenes]], [[alkynes]], and [[aromatic hydrocarbons]]. They play a crucial role in [[organic chemistry]], [[biochemistry]], and various industrial applications.

==Types of Unsaturated Compounds==

===Alkenes===
Alkenes are unsaturated hydrocarbons containing at least one carbon-carbon double bond. They follow the general formula C_nH_2n and are characterized by the presence of a [[pi bond]] in addition to a [[sigma bond]], which allows for the double bond. Examples include [[ethylene]] (C_2H_4), the simplest alkene, and [[propene]] (C_3H_6).

===Alkynes===
Alkynes are characterized by having at least one carbon-carbon triple bond, following the general formula C_nH_2n-2. This bond consists of one sigma bond and two pi bonds, making alkynes more reactive than alkenes. [[Acetylene]] (C_2H_2) is the simplest and most well-known alkyne.

===Aromatic Hydrocarbons===
Aromatic hydrocarbons, or arenes, are a class of unsaturated compounds that contain one or more planar rings of carbon atoms with delocalized pi electrons. The most common example is [[benzene]] (C_6H_6), which has a six-carbon ring with alternating double and single bonds.

==Properties and Reactions==
Unsaturated compounds exhibit distinct physical and chemical properties compared to their saturated counterparts. They tend to be more reactive due to the presence of double or triple bonds, which are sites of higher electron density and can participate in various chemical reactions.

===Addition Reactions===
One of the most characteristic reactions of unsaturated compounds is the addition reaction, where atoms or groups are added to the carbon atoms involved in the double or triple bond. This includes [[hydrogenation]], where hydrogen is added to convert unsaturated compounds to saturated ones, and [[halogenation]], where halogens are added.

===Polymerization===
Unsaturated compounds, especially alkenes, can undergo polymerization, a process where small molecules, called monomers, combine to form long-chain polymers. This reaction is fundamental in the production of various [[plastics]] and synthetic materials.

==Applications==
Unsaturated compounds have widespread applications in the chemical industry, including the manufacture of [[plastics]], [[synthetic rubber]], and [[detergents]]. They are also essential in the synthesis of [[vitamins]], [[pharmaceuticals]], and other [[biochemicals]].

==Environmental and Health Aspects==
While unsaturated compounds are invaluable in various applications, some, like certain aromatic hydrocarbons, can pose environmental and health risks. For example, benzene is known to be carcinogenic, and its exposure should be minimized.

[[Category:Organic chemistry]]
[[Category:Chemical compounds]]

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Unsaturated compound - Revision history

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