1 / 17

Topic: Alkenes & Alkynes (unsaturated hydrocarbons)

Topic: Alkenes & Alkynes (unsaturated hydrocarbons). Do Now: Name the following. Are the Isomers?. Unsaturated hydrocarbons : organic compounds containing one or more double or triple bonds – can add more H by breaking the bond. Alkenes. Another homologous series of hydrocarbons

keaira
Download Presentation

Topic: Alkenes & Alkynes (unsaturated hydrocarbons)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Topic: Alkenes & Alkynes (unsaturated hydrocarbons) Do Now: Name the following. Are the Isomers?

  2. Unsaturatedhydrocarbons: organic compounds containing one or more double or triple bonds – can add more H by breaking the bond

  3. Alkenes • Another homologous series of hydrocarbons • Each member contains at least one double covalent bond between C atomsSo alkenes are unsaturated • General formula = CnH2n

  4. Properties of Alkenes • Nonpolar – low solubility in H2O • fairly low melting and low boiling points • More reactive than alkanes : • double bond is site of reactivity

  5. 1st member is C2H4: ethene H H C=C H H Naming Alkenes • Count longest carbon chain • prefix tells # of C’s in longest chain and add ‘ene’

  6. If more than 4 Carbons • give 1st carbon in double bond the lowest possible number when numbering the chain ] 1-butene 2-butene

  7. If 2 double bonds = diene 1,3 pentadiene

  8. Naming Branched-Chain Alkenes • 1st carbon in Double bond gets lowest number • Then name branches based on numbers assigned • Branch name and number come first when naming • Chain + ene come at the end • Example: 2-methyl 3-Nonene

  9. 3 methyl, 1-butene 4 3 2 1

  10. Alkynes • Homologous series of unsaturated hydrocarbons • Each member contains at least one C≡C bond • General formula = CnH2n-2

  11. Properties of Alkynes • Nonpolar – low solubility in H2O • fairly low melting and low boiling points • More reactive than alkenes : • triple bond is site of reactivity

  12. Naming Alkynes • Same as alkene just add ‘yne’ to the end instead

  13. H–CC–H C2H2 ethyne CHCH H H–CC–C–H H propyne C3H4 CHCCH3 CHCCH2CH3 1-butyne C4H6 C4H6 2-butyne CH3CCCH3 H H H–CC–C–C–H H H H H H–C–CC–C–H H H

  14. Name of Series General Formula Ending Alkanes CnH2n+2 -ane Alkenes CnH2n -ene Alkynes CnH2n-2 -yne 3 Homologous Series of HC’s

  15. Which compound belongs to the alkene series? • C2H2 • C2H4 • C6H6 • C6H14 Correct answer = B Alkenes follow the format CnH2n A & C are CnHn , D is CnH2n+2

  16. In which group could the hydrocarbons all belong to the same homologous series? • C2H2, C2H4, C2H6 • C2H4, C3H4, C4H8 • C2H4, C2H6, C3H6 • C2H4, C3H6, C4H8 Correct answer = D Members of homologous series all have same relationship between atoms Every compound in set D fits the formula CnH2n

  17. Which of the following is a saturated hydrocarbon? • Ethene • Ethyne • Propene • Propane Correct answer = D all alkanes are saturated

More Related