1. Numbered Heads Together
You work in group of 4.
I will number you 1 to 4
I poses a question.
4. You each write the answer on a separate piece of paper that I give you
5. All 4 in the group then put their heads together to ensure all members can answer the question
6. I call a number and if you have this number, you share your group’s answers with the class.

2. 1. Name:

3. 1. Answer
1st branch 2
4-cyclobutyl-2-fluoro-6-methyloctane

4. 2. Draw
2,5-dimethylhept-3-yne

5. 2. Answer
2,5-dimethyl-3-heptyne

6. 3. Identify the mistake in the following name
4-ethyl-2-methylpentane
(hint: Draw out the molecule)

7. 3. Identify the mistake in the following name- ANSWER
4-ethyl-2-methylpentane Longest chain is 6 C not 5C
Correct name should be
2, 4- dimethylhexane

8. 4. Which would have lower bp? Why?

9. 4. Which would have higher bp? Why?
Because it’s a more linear molecule even though it has fewer # of e-  better contact, stronger LD & pack better

10. Review DB geometry or
No rotation around DB

11. Geometric isomers = cis/trans isomers
Which is cis? trans?
cis
Because 2 chlorine on the same side of the C=C
trans
Because 2 chlorine on the opposite sides of the C=C

12. Could you name these with cis and trans?

13. Need another system: E Z system & a priority list
Atom which has the higher atomic number is given the higher priority.

14. Geometric isomers: E Z system
Zusammen (german) means together
Entgegen means opposite
(Z)- rest of name
(E)- rest of name
Z (zame): when 2 higher priortity groups on the
Zame side of the DB
E (enemies) : when 2 higher priority groups on opposite sides of the DB

15. E or Z?
(E)-but-2-ene.
E,Z will always work, even when cis,trans fails

16. 4. Draw and name all geometric isomers of C3H3Cl3

17. 4. All geometric isomers of C3H3Cl3 ANSWER
(E)-1,3,3-trichloropropene
(trans)-1,2,3-trichloropropene
(cis)-1,2,3-trichloropropene
(Z)-1,3,3-trichloropropene

18. 5. List all the special properties of

19. 5. Benzene special properties answer
Flat molecule  efficiently stack/pack
All C are sp2 hybridized
Resonance structure
Stable and non-reactive unlike alkenes
Aromas
Non-polar

20. 6. Name:

21. 6. Answer
1-chloro-2-isobutylbenzene Or o-chloroisobutylbenzene

22. Quiz Mon Apr 4 2016 Naming hydrocarbons:
Aliphatic (non-cyclic & cyclic)
Aromatic
Know/able to explain their physical properties according their structure; draw all possible isomers including geometric isomers for alkenes