Answer
a. Methane.
b. Propane.
c. Cyclohexane.
d. Nonane.
Work Step by Step
1. If the molecules is cyclic, write "Cyclo-" as a prefix.
a.
b.
c. Cyclo-
d.
2. Count the amount of carbons and use the appropriate IUPAC prefixes (See page 447)
a. Meth-
b. Prop-
c. Cyclohex-
d. Non-
3. All alkanes contain an "ane" after that, to represent the group.
a. Methane.
b. Propane.
c. Cyclohexane.
d. Nonane.