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Chemistry LibreTexts

9: Unsaturated Hydrocarbons

  • Page ID
    • 9.1: Alkenes - Structures and Names
      Alkenes are hydrocarbons with a carbon-to-carbon double bond.
    • 9.2: Cis-Trans Isomerism
      Cis-trans (geometric) isomerism exists when there is restricted rotation in a molecule and there are two nonidentical groups on each doubly bonded carbon atom.
    • 9.3: Physical Properties of Alkenes
      The physical properties of alkenes are much like those of the alkanes: their boiling points increase with increasing molar mass, and they are insoluble in water.
    • 9.4: Chemical Properties of Alkenes
      Alkenes undergo addition reactions, adding such substances as hydrogen, bromine, and water across the carbon-to-carbon double bond.
    • 9.5: Polymers
      Molecules having carbon-to-carbon double bonds can undergo addition polymerization.
    • 9.6: Alkynes
      Alkynes are similar to alkenes in both physical and chemical properties. For example, alkynes undergo many of the typical addition reactions of alkenes. The International Union of Pure and Applied Chemistry (IUPAC) names for alkynes parallel those of alkenes, except that the family ending is -yne rather than -ene. The IUPAC name for acetylene is ethyne. The names of other alkynes are illustrated in the following exercises.
    • 9.7: Aromatic Compounds - Benzene
      Aromatic hydrocarbons appear to be unsaturated, but they have a special type of bonding and do not undergo addition reactions.
    • 9.8: Structure and Nomenclature of Aromatic Compounds
      Aromatic compounds contain a benzene ring or have certain benzene-like properties; for our purposes, you can recognize aromatic compounds by the presence of one or more benzene rings in their structure.

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