1. Alkenes & Alkynes

2. Alkenes  Hydrocarbons containing double bonds.  General Formula: C n H 2n  They are unsaturated – the double bond is a reactive site for other atoms to bond to the carbon atom.

3. Naming Alkenes  Alkenes # of C AtomsPrefixAlkene 2Eth-Ethene 3Prop-Propene 4But-Butene 5Pent-Pentene 6Hex-Hexene 7Hept-Heptene 8Oct-Octene 9Non-Nonene 10Dec-Decene

4. Naming Alkenes 1. The parent chain must contain the double bond. (even if it is not the longest chain)

5. Naming Alkenes 2. The parent chain carbon atoms are numbered starting at the end closest to the double bond.

6. Naming Alkenes 2. The position of the double bond is indicated in the name by stating the number of the carbon atom in the parent chain that the double bond follows. 3. 1-pentene

7. Naming Alkenes 3. Name the branches.

8. Naming Alkenes 4. Name the compound. 2-ethyl-1-pentene

9. Naming Alkenes 1. Parent Chain. 2. Number the parent chain. 3. Name the branches. 4. Name the compound 2-hexene

10. Naming Alkenes 1. Parent Chain. 2. Number the parent chain. 3. Name the branches. 4. Name the compound 1,3-pentadiene

11. Alkynes  Hydrocarbons containing triple bonds.  General Formula: C n H 2n-2  They are unsaturated – the double bond is a reactive site for other atoms to bond to the carbon atom.

12. Naming Alkynes  The same rules for naming an alkene apply; however the ending is “yne” instead of “ene.”

13. Naming Alkynes  Alkynes # of C AtomsPrefixAlkyne 2Eth-Ethyne 3Prop-Propyne 4But-Butyne 5Pent-Pentyne 6Hex-Hexyne 7Hept-Heptyne 8Oct-Octyne 9Non-Nonyne 10Dec-Decyne

14. Naming Alkynes 1. Parent Chain. 2. Number the parent chain. 3. Name the branches. 4. Name the compound 3-methyl-1-pentyne

15. Naming Alkynes 1. Parent Chain. 2. Number the parent chain. 3. Name the branches. 4. Name the compound 3-ethyl-4-methyl-1-hexyne