Organic Chemistry II
	Professor Carl C. Wamser
Chem 335 - Winter 2006	Pre-Quiz 10

(must be done in WebCT before Wed., Jan. 11, 8:30 am)

1. Cyclohexene has how many hydrogens that would be categorized as vinylic or allylic?

a. 2 vinylic, 2 allylic  
b. 2 vinylic, 3 allylic  
* c. 2 vinylic, 4 allylic  
d. 1 vinylic, 2 allylic  
e. 1 vinylic, 3 allylic  
f. 1 vinylic, 4 allylic  
g. 2 vinylic, 8 allylic

2. Which of the following is a conjugated diene?

a. allene  
b. 1,2-hexadiene  
* c. 1,3-hexadiene  
d. 1,4-hexadiene  
e. 1,5-hexadiene  
f. more than one of the above  
g. none of the above

3. The 1,1-dimethylallyl cation has the positive charge mainly on which type of carbon?

a. primary (1°)  
b. secondary (2°)  
* c. tertiary (3°)  
d. quaternary (4°)  
e. equally on more than one carbon

4. Rotation around the central C-C bond in 1,3-butadiene has an activation energy of about

a. 1 kcal/mol  
* b. 4 kcal/mol  
c. 10 kcal/mol  
d. 16 kcal/mol  
e. 28 kcal/mol

5. The Diels-Alder reaction between 1,3-butadiene and ethene would produce

a. 1,3-hexadiene  
b. 1,4-hexadiene  
c. 2-hexene  
d. 3-hexene  
* e. cyclohexene