U

Unsaturated Hydrocarbons

C=C double bonds present; CₙH₂ₙ (alkene family)
Quick Reference
Formula / NotationC=C double bonds present; CₙH₂ₙ (alkene family)
Also Known AsAlkenes, alkynes, unsaturated organic compounds, olefins

What is Unsaturated Hydrocarbons?

Hydrocarbons containing one or more carbon-carbon multiple bonds (double or triple bonds). Alkenes contain at least one C=C double bond; alkynes contain at least one C≡C triple bond. Unsaturated hydrocarbons are more reactive than alkanes and can undergo addition reactions.

Formula & Notation

C=C double bonds present; CₙH₂ₙ (alkene family)

Other Names / Synonyms: Alkenes, alkynes, unsaturated organic compounds, olefins

Properties & Characteristics

Unsaturated hydrocarbons are organic compounds containing one or more carbon-carbon double or triple bonds, meaning they contain fewer hydrogen atoms than the corresponding saturated compound. Alkenes (one double bond) and alkynes (one triple bond) are the main classes. The double or triple bonds are sites of chemical reactivity, particularly addition reactions. Aromatic hydrocarbons (benzene) are a special class of unsaturated compounds.

Uses & Applications

Ethylene (simplest alkene) is the most produced organic chemical, used to make polyethylene plastic. Propylene is used to make polypropylene. Unsaturated fatty acids in oils are nutritionally important. Acetylene (alkyne) is used in metal welding.

Safety Information

Many unsaturated hydrocarbons are flammable and their vapours form explosive mixtures with air. Prolonged exposure to aromatic unsaturated hydrocarbons like benzene causes serious health effects including leukaemia.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Unsaturated Hydrocarbons
Formula C=C double bonds present; CₙH₂ₙ (alkene family)
Synonyms Alkenes, alkynes, unsaturated organic compounds, olefins

Frequently Asked Questions

Hydrocarbons containing one or more carbon-carbon multiple bonds (double or triple bonds). Alkenes contain at least one C=C double bond; alkynes contain at least one C≡C triple bond. Unsaturated hydrocarbons are more reactive than alkanes and can undergo addition reactions.

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