tulis rumus bangun dari : G. 3,3-dietilpentana H. 4-etil-3,6-dimetiloktana I. 4-etil-,2,6-dimetilheptana bantu kak plis! thanks

G. C2H5
|
CH3-CH2-C-CH2-CH3
|
C2H5

H. CH3-CH2-CH-CH-CH2-CH-CH2-CH3
| | |
CH3 C2H5. CH3

I. CH3-CH-CH2-CH-CH2-CH-CH3
| | |
CH3. C2H5. CH3.