SCIENCE 9 - ALKENE for Chemistry 9..pptx

Carbon Compound

1. SCIENCE 9 ELJUN M. ARQUITA, PRE-SERVICE TEACHER

2. REVIEW…

3. S EE MY N AME !

4. DOUBLE BOND

5. UNSATURATED

6. NAMING

7. HYDROCARBON

8. ALKENE

9. ALKENE

10. LEARNING OBJECTIVES a .) identify alkene; b .) illustrate structure and naming of alkene; and c .) state the importance of the knowing about difference between alkane, alkene,and alkyne.

11. ALKENE Unsaturated hydrocarbon that contain at least one or more double bond. Alkenes are more reactive than alkanes due to the presence of double bond . Another term used to describe alkene is olefins or oil forming hydrocarbon

12. GENERAL FORMULA C n H 2n SIMPLEST FORM “Ethylene or Ethene ” Molecular formula C 2 H 2(2 ) = C 2 H 4

13. How to name an ALKENE? To name alkene, indicate of the double bonds between carbon atoms. The name alkene compounds end with – ene . Like in naming alkanes, the number of carbon chain determines the name of the parent compound. The number of the double bond in such molecules is shown by using a prefix (-di, -tri, -tetra) before the suffix - ene .

14. How to name an ALKENE? CH3-CH2-CH=CH-CH=CH-CH3 The longest chain that includes a double bond contains seven carbon atom. These corresponds to Heptene .

15. How to name an ALKENE? 7 CH3- 6 CH2- 5 CH= 4 CH- 3 CH= 2 CH- 1 CH3 The numbering that will give the double bonds the lowest sets if numbers is as follows.

16. How to name an ALKENE? 7 CH3- 6 CH2- 5 CH= 4 CH- 3 CH= 2 CH- 1 CH3 The double bond appeared in carbon atoms 2 and 4. Hence , the name of this compound is “2,4-heptadiene”

17. The longest chain that includes a double bond contains seven carbon atom. These corresponds to Heptene .

18. The double bond appeared at carbon 3. The parent alkene chain is 3-heptene. There are two methyl substituents at carbon 2 and 6. The name of the molecules is 2,6-dimethyl-3-heptene or 2,6-dimethylhept-3-ene

19. 2-methylbut-2-ene

20. 3-isopropylhex-2-ene

21. 4-ethyl-2,3-dimethylhept-2-ene

22. 3,6-dimethylhepta-2,4-diene

23. 2-isopropylhexa-1,4-diene

24. Octa-1,3-diene 2,4-dimethylpent-2-ene 2,3,4-trimethylhept-2-ene 5-methylhepta-1,4-diene

25. RECAP!

26. 1. What is alkene? 2 . What is the general formula for ethene ? 3 . Where should we start numbering the longest chain in alkene? 4 . State the importance of the knowing about difference between alkane, alkene, and alkyne?

27. LET’S TEST YOUR UNDERSTANDING!

28. 1) 2 ) 3 ) 4 )