Alkenes and alkynes
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Alkenes and Alkynes. Alkenes. hydrocarbons that contain one or more double bonds Non-polar General formula C n H 2n. Properties of Alkenes. Unsaturated hydrocarbon Boiling points are slightly less than the boiling points of similar-sized alkanes Non-polar – low solubility in water

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Alkenes and Alkynes

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Alkenes and alkynes

Alkenes and Alkynes


Alkenes

Alkenes

  • hydrocarbons that contain one or more double bonds

  • Non-polar

  • General formula CnH2n


Properties of alkenes

Properties of Alkenes

  • Unsaturated hydrocarbon

  • Boiling points are slightly less than the boiling points of similar-sized alkanes

  • Non-polar – low solubility in water

  • More reactive than alkanes


Naming alkenes

Naming Alkenes

  • Follow the same format as alkanes:

    Prefix+Root+ Suffix

    *the suffix for alkenes is -ene

  • Also need the location of the double bond

  • The double bond has the lowest possible position number


Cis trans geometric isomers

Cis-Trans (Geometric) Isomers


General rules for geometric isomers

General Rules for Geometric Isomers

  • Each carbon in the C=C double bond must be attached to two different groups.

  • In a cis isomer the two larger groups are attached to each C=C double bond on the same side.

  • In a trans isomer, the two larger groups are attached to each C=C double bond on opposite sides.


Alkynes

Alkynes

  • Contain one or more triple bonds

  • Unsaturated hydrocarbons

  • Structure with a triple bond is linear

  • More reactive than the double bond

  • General formula CnH2n-2

  • Naming alkynes follow the same rules for alkenes


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