Answer
a. Pentane
b. Ethane
c. Hexane
d. Cycloheptane
Work Step by Step
1. If the molecules is cyclic, write "Cyclo-" as a prefix.
d. Cyclo-
2. Count the amount of carbons and use the appropriate IUPAC prefixes (See page 447)
a. Pent-
b. Eth-
c. Hex-
d. Cyclohept-
3. All alkanes contain an "ane" after that, to represent the group.
a. Pentane
b. Ethane
c. Hexane
d. Cycloheptane