Question #1: 

2,2-dimethylbutane
3,3-dimethylbutane
2-ethyl-2-methylpropane
2,2-ethylmethylpropane
both "a" and "c"


Question #2: 

2,3-dimethyl-4-ethylhexane
3-ethyl-1,1,2-trimethylpentane
3-ethyl-4,5-dimethylhexane
4-ethyl-2,3-dimethylhexane
4,5-dimethyl-3-ethylhexane


Question #3: 

2-bromo-2-chloropentane
4-bromo-2-chloropentane
2-bromo-4-chloropentane
1-bromo-3-chloro-1-methylbutane
both "a" and "c"


Question #4: 

5-methyl-3,4-diethylheptane
3,4-diethyl-5-methylheptane
4,5-diethyl-3-methylheptane
4,5,5-triethyl-3-methylpentane
1,1,2-triethyl-3-methylpentane


Question #5: 

5-isopropyl-4-propylnonane
4-isopropyl-5-propylnonane
2-methyl-3,4-dipropyloctane
4,5-dipropylnonane
4,5-diisopropylnonane


Question #6: 

4-ethyl-1,5-diiodooctane
5-ethyl-4,8-diiodooctane
4-ethyl-1,5-diodooctane
4-ethyl-1,5-diiodoctane
4-ethyl-1,5-diodoctane


Question #7: 

isobutane
butane
2-methylpropane
isobutyl
both "a" and "c"


Question #8: 

5-butyl-8,8,8-triethyl-2-methyloctane
4-butyl-1,1,1-triethyl-7-methyloctane
6-butyl-3,3-diethyl-9-methyldecane
5-butyl-8,8-diethyl-2-methyldecane
3,3-diethyl-6-isopentylnonane


Question #9: 

propylpropane
isopropylpropane
propylcyclopropane
isopropylcyclopropane
both "a" and "c"


Question #10: 

trans-1-bromo-2-methylcyclopentane
cis-1-bromo-2-methylcyclopentane
trans-2-bromo-1-methylcyclopentane
cis-2-bromo-1-methylcyclopentane
trans-1-bromo-2-ethylcyclopentane


Question #11: 

3-bromo-1,1-dimethylcyclobutane
1-bromo-3,3-dimethylcyclobutane
4-bromo-2,2-dimethylcyclobutane
2-bromo-4,4-dimethylcyclobutane
both "a" and "c"


Question #12: 

trans-4-ethyl-1-methylcyclohexane
trans-1-ethyl-4-methylcyclohexane
cis-1-ethyl-4-methylcyclohexane
cis-4-ethyl-1-methylcyclohexane
cis-1-ethyl-4-methylhexane


Question #13: 

3,3-dipropylcycloheptane
3,3-diisopropylcycloheptane
1,1-dipropylcycloheptane
1,1-diisopropylcycloheptane
dipropylcycloheptane


Question #14: 

2,2-dimethylpropane
isopentane
neopentane
isobutane
both "a" and "c"


Question #15: 

4,4-difluoro-1-methylcyclooctane
1,1-difluoro-4-methylcyclooctane
7,7-difluoro-2-methylcyclooctane
3,3-difluoro-7-methylcyclooctane
both "a" and "c"


Question #16:

1-chloro-1,3-dimethylcyclobutane
3-chloro-1,3-dimethylcyclobutane
2-chloro-2,4-dimethylcyclobutane
4-chloro-2,4-dimethylcyclobutane
both "a" and "c"


Question #17: 

4-cyclopentylnonane
5-cyclopentyloctane
4-cyclopentyloctane
1-cyclopentyl-1-propylpentane
both "a" and "c"


Question #18: 

cis-3-bromo-6-ethylcyclohexane
trans-3-bromo-6-ethylcyclohexane
cis-1-bromo-4-ethylcyclohexane
trans-1-bromo-4-ethylcyclohexane
both "a" and "c"


Question #19: 

4-isopentyl-3-propylheptane
3-methyl-5,6-dipropyloctane
6-methyl-3,4-dipropyloctane
4-ethyl-7-methyl-5-propylnonane
6-ethyl-3-methyl-5-propylnonane


Question #20: 

3-cyclobutyl-5,5-dipropylnonane
3-cyclobutyl-5,5-diisopropylnonane
5-butyl-3-cyclobutyl-5-propyloctane
5-butyl-3-cyclobutyl-5-isopropyloctane
4-butyl-6-cyclobutyl-4-propyloctane