Question #1: 

7-propylbicyclo[4.1.1]octane
7-isopropylbicyclo[4.1.1]octane
2-propylbicyclo[4.1.1]octane
2-isopropylbicyclo[4.1.1]octane
7-(2-methylethyl)bicyclo[4.1.1]octane


Question #2: 

2-(1,2-dimethylpropyl)bicyclo[4.3]nonane
2-(1,2-dimethylpropyl)bicyclo[4.3.0]nonane
7-(1,2-dimethylpropyl)bicyclo[4.3]nonane
7-(1,2-dimethylpropyl)bicyclo[4.3.0]nonane
4-(1,2-dimethylpropyl)bicyclo[4.3]nonane


Question #3: 

6-bromo-2-methylspiro[4.4]nonane
2-bromo-6-methylbicyclo[4.4]nonane
2-bromo-6-methylspiro[4.4]nonane
6-bromo-2-methylbicyclo[4.4]nonane
both "a" and "c"


Question #4: 

8-bromo-7-chlorobicyclo[4.2.0]octane
7-bromo-8-chlorobicyclo[4.2.0]octane
8-bromo-7-chlorobicyclo[4.2]octane
7-bromo-8-chlorobicyclo[4.2]octane
both "a" and "c"


Question #5: 

2-bromo-7-methylbicyclo[4.3.2]undecane
7-bromo-11-methylbicyclo[4.3.2]undecane
9-bromo-10-methylbicyclo[4.3.2]undecane
7-bromo-11-methylbicyclo[4.3.2]decane
2-bromo-7-methylbicyclo[4.3.2]decane


Question #6: 

6-methylbicyclo[3.2.0]heptane
6-methylbicyclo[3.2]heptane
2-methylbicyclo[3.2.0]heptane
2-methylbicyclo[3.2]heptane
2-methylspiro[3.2]heptane


Question #7: 

7-(1,1-dimethylethyl)bicyclo[4.3.1]decane
2-(1,1-dimethylethyl)bicyclo[4.3.1]decane
7-tert-butylbicyclo[4.3.1]decane
2-tert-butylbicyclo[4.3.1]decane
both "a" and "c"


Question #8: 

5-ethyl-1,5-dimethylspiro[5.5]undecane
1-ethyl-1,5-dimethylspiro[5.5]undecane
6-ethyl-2,6-dimethylspiro[5.5]undecane
2-ethyl-2,7-dimethylspiro[5.5]undecane
3-ethyl-3,8-dimethylspiro[5.5]undecane


Question #9: 

1,1-diethylspiro[5.4]octane
2,2-diethylspiro[4.3]octane
5,5-diethylspiro[4.3]octane
1,1-diethylspiro[4.3]octane
both "a" and "c"


Question #10: 

3-ethyl-9-methylbicyclo[4.2.1]nonane
2-ethyl-9-methylbicyclo[4.2.1]nonane
2-ethyl-8-methylbicyclo[4.2.1]nonane
5-ethyl-2-methylbicyclo[4.2.1]nonane
3-ethyl-7-methylbicyclo[4.2.1]nonane


Question #11: 

2-isopropylbicyclo[3.3.0]octane
2-isopropylbicyclo[3.3]octane
2-propylbicyclo[3.3.0]octane
2-propylbicyclo[3.3]octane
both "a" and "c"


Question #12: 

7-bromo-2,7-dimethylbicyclo[5.3]nonane
2-bromo-2,5-dimethylbicyclo[5.3]nonane
6-bromo-1,6-dimethylspiro[5.3]nonane
2-bromo-2,5-dimethylspiro[5.3]nonane
both "a" and "c"


Question #13: 

2-ethyl-8-methylbicyclo[3.1.1]heptane
2-ethyl-7-methylbicyclo[3.1.1]heptane
2-ethyl-6-methylbicyclo[3.1.1]heptane
4-ethyl-7-methylbicyclo[3.1.1]heptane
both "a" and "c"


Question #14: 

2-sec.butyl-7-methylbicyclo[2.2.1]heptane
2-butyl-7-methylbicyclo[2.2.1]heptane
2-(1-methylpropyl)-7-methylbicyclo[2.2.1]heptane
2-isobutyl-7-methylbicyclo[2.2.1]heptane
both "a" and "c"


Question #15: 

1-chlorospiro[5.2]octane
6-chlorospiro[5.2]octane
2-chlorospiro[5.2]octane
7-chlorospiro[5.2]octane
both "a" and "c"


Question #16: 

2-methyl-7-propylbicyclo[3.3.2]decane
6-methyl-3-propylbicyclo[3.3.2]decane
2-methyl-7-isopropylbicyclo[3.3.2]decane
6-methyl-3-isopropylbicyclo[3.3.2]decane
both "a" and "c"


Question #17: 

7,7-dimethylbicyclo[2.2.2]octane
1,1-dimethylbicyclo[2.2.2]octane
2,2-dimethylbicyclo[2.2.2]octane
8,8-dimethylbicyclo[2.2.2]octane
both "a" and "c"


Question #18: 

2-(1-methylpropyl)spiro[5.4]decane
2-sec-butylspiro[5.4]decane
2-butylspiro[5.4]decane
2-isobutylspiro[5.4]decane
2-propylspiro[5.4]decane


Question #19:
 

2-ethyl-6-neopentylbicyclo[3.3.1]nonane
2-ethyl-6-tert-pentylbicyclo[3.3.1]nonane
6-(2,2-dimethylpropyl)-2-ethylbicyclo[3.3.1]nonane
2-ethyl-6-isopentylbicyclo[3.3.1]nonane
both "a" and "c"


Question #20: 

6,6-difluorobicyclo[3.2.1]octane
1,1-difluorobicyclo[3.2.1]octane
2,2-difluorobicyclo[3.2.1]octane
3,3-difluorobicyclo[3.2.1]octane
both "a" and "c"