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