CH3-CH2-CH2-CH2-CH2-OH 1-PENTANOL 

CH3-CH2-CH2-CH-CH3 2-PENTANOL 
.......................| 
......................OH 

CH3-CH2-CH-CH2-CH3 3-PENTANOL 
...............| 
..............OH 

CH3-CH-CH2-CH2-OH 3-METYL-1-BUTANOL 
........| 
.......CH3 

CH3-CH2-CH-CH2-OH 2-METYL-1-BUTANOL 
...............| 
..............CH3 

.......CH3 
........| 
CH3-C-CH2-OH 2,2-DYMETYL-1-PROPANOL 
........| 
.......CH3 

CH3-CH-CH-CH3 3-METYL-2-BUTANOL 
........|......| 
.......CH3 OH 

..............CH3 
...............| 
CH3-CH2-C-CH3 2-METYL-2-BUTANOL 
...............| 
..............OH