Chem 334 - Fall 1999
Organic Chemistry I

Dr. Carl C. Wamser

Chapter 7 Pre-Quiz

1. The mechanism for free radical halogenation of an alkane is described as

a) exothermic

b) addition

c) chain reaction

d) nucleophilic

e) electrophilic

2. Although fluorine is the most electronegative halogen, the dipole moment of methyl fluoride is smaller than that of methyl chloride because

a) dipole moments don't relate to electronegativity

b) methyl fluoride has a lower boiling point

c) the C-F bond is more ionic

d) the C-F bond is shorter

e) the C-Cl bond involves larger charge differences

3. Perfluorocyclohexane would have how many fluorines?

a) 6

b) 10

c) 12

d) more than 12

e) some other number

4. Some perfluorocarbons are useful as artificial blood because

a) they are red

b) they have low boiling points

c) they are nonpolar

d) they dissolve many biologically important compounds

e) they dissolve high concentrations of oxygen

5. In a chain propagation step

a) free radicals recombine with one another

b) an initiator starts a chain reaction

c) an inhibitor stops a chain reaction

d) a radical reacts to form a different radical

e) there is typically a high activation energy