C5H12

Có 3 đồng phân: CH3 - (CH2)3 - CH3 (n pentan), (CH3)2 - (CH2)2 - CH3 (iso pentan) và (CH3)2 - C - (CH3)2 (neo pentan)

C6H14:

1)CH3-CH2-CH2-CH2-CH2-CH3

2)CH3-CH-CH2-CH2-CH3
----------'CH3

3)CH3-CH2-CH-CH2-CH3
-------------------'CH3

4)CH3-CH-CH-CH3
---------'CH3-'CH3

5) -------,CH3
---CH3-C-CH2-CH3

----------'CH3

C7H16.

CH3 - CH2 - CH2 - CH2 - CH2 - CH2 - CH3 : heptan

CH3 - CH - CH2 - CH2 - CH2 - CH3 : 2-metylhexan
.........CH3

CH3 - CH2 - CH - CH2 - CH2 - CH3 : 3 - metylhexan
....................CH3

CH3 - CH - CH - CH2 - CH3 : 2,3 - đimetylpentan
.........CH3...CH3

Ch3 - CH - CH2 - CH - CH3 : 2,4 - đimetylpentan
.........CH3...........CH3

.........CH3
CH3- C - CH2 - CH2 - CH3 : 2,2- đimetylpentan
.........CH3


........--.CH3
CH3---.C --- CH - CH3 : 2,2,3 trimetylbutan
........-.CH3...CH3


...........................CH3
.........CH3 - CH2 - C - CH2 - CH3 : 3,3 - đimetylpentan
...........................CH3


CH3- CH2 - CH - CH2 - CH3 : 3- etyl pentan
...................CH2 - CH3