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Alkenes and Alkynes

Alkenes and Alkynes. David Wu. Physical Properties. of Alkenes. Physical Properties of Alkenes. C olorless & odorless (no color, no smell) Physical State depends on molecular mass . Physical State. The simplest alkenes, ethene , propene and butene are gases .

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Alkenes and Alkynes

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  1. Alkenes and Alkynes David Wu

  2. Physical Properties of Alkenes

  3. Physical Properties of Alkenes • Colorless & odorless (no color, no smell) • Physical State depends on molecular mass.

  4. Physical State • The simplest alkenes, ethene, propene and butene are gases. • Linearalkenes of approximately 5 to 16 carbons are liquids, and higheralkenes are waxy solids.

  5. Physical Properties of Alkenes • Alkenes has a smallerdensity than water. • So they are insoluble in water.

  6. Boiling point • The more intermolecular mass is added, the higher the boiling point. • Intermolecular forces of alkenes gets stronger with increase in the sizeof the molecules.

  7. Chemical properties of Alkenes

  8. Chemical properties of Alkenes • Relativelystablecompounds • But are more reactive than alkanes due to the presence of a carbon–carbon pi-bond.

  9. Use of Alkenes Forming products such as halogenoalkanes, alcohols or amines. Alkenes are raw materials for plastics such as polythene, PVC and polystyrene.

  10. Physical Properties of Alkynes

  11. Physical Properties of Alkynes • Insolublein water • But are fairly soluble in organic solvents (such as, alcohol, ether, acetone etc)

  12. Chemical Properties of Alkynes

  13. Chemical Properties of Alkynes • The melting and boiling points of alkynes increase with molecular mass • Characteristically more unsaturated than alkenes • Usually more reactive than alkenes.

  14. Use of Alkynes A carbon–carbon triple bond is also present in marketed drugs (such as the antiretroviral Efavirenz and the antifungal Terbinafine)

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