1) CH2-CH-CH2-CH2
I I I
OH CH3 OH
2) CH3 CH3
I I
CH3- C C-CH2-CH3
OH OH
3) CH3
I
CH2-CH2 -C-CH2-CH-CH3
OH OH OH
1) CH2-CH-CH2-CH2
I I I
OH CH3 OH
2) CH3 CH3
I I
CH3- C C-CH2-CH3
I I
OH OH
3) CH3
I
CH2-CH2 -C-CH2-CH-CH3
I I I
OH OH OH