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Overview of Unsaturated Hydrocarbons: Alkenes and Alkynes

Unsaturated hydrocarbons are organic compounds that contain carbon atoms with at least one double or triple bond. Alkenes, characterized by the general formula CnH2n, include structures with at least one double bond, and their names typically end in –ene. Examples include 3-ethyl-1-pentene and 1,3-butadiene. Alkynes have the general formula CnH2n-2, containing at least one triple bond, and are named with an ending of –yne. Examples include 2-pentyne and 3-ethyl-3-methyl-1-hexyne. This guide explores their structures and naming conventions.

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Overview of Unsaturated Hydrocarbons: Alkenes and Alkynes

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  1. Unsaturated Hydrocarbons • Hydrocarbons that don’t contain all single bonds between the carbon atoms.

  2. Alkenes • Have the general formula CnH2n • Structure contains at least one double bond. • When naming them, the parent chain name ends in –ene.

  3. Draw: 3-ethyl-1-pentene

  4. Draw: 1,3-butadiene

  5. Draw: 4-butyl-1-cyclohexene

  6. Name: C-C=C-C=C=C-C-C

  7. Alkynes • Have the general formula CnH2n-2 • Structure contains at least one triple bond. • When naming them, the parent chain name ends in –yne.

  8. Draw: 2-pentyne

  9. Draw:3-ethyl-3-methyl-1-hexyne

  10. Name: C C-C-C-C-C-C-CΞC-C C C-C-C-C

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