Mohon bantuannya, soal kimia organik

a. 2-etil-4-metil pentana
b. 2-metil pentana
c. 5-etil-2,2-dimetil heptana
d. 3-metil pentana
e. aku ga tau. maaf ya :)
silakan diperiksa lagi..

[tex]\displaystyle a.\text{ 2,4-dimetilheksana}\\b.\text{ 2-metilpentana}\\c.\text{ 5-etil-2,2-dimetilheptana}\\d.\text{ 3-metilpentana}\\e.\text{ 3-etil-2,4-dimetil-6-isopropilnonana}\\\\f.\text{CH}_3(\text{CH}_2)_2\text{C}(\text{C}_2\text{H}_5)(\text{CH}_3)\text{CH}(\text{CH}_3)(\text{CH}_2)_3\text{CH}_3\\g.\text{CH}_3\text{C}(\text{CH}_3)_2(\text{CH}_2)_2\text{CH}(\text{C}_2\text{H}_5)\text{CH}_2\text{CH}_3\\h.\text{CH}_3(\text{CH}_2)_8\text{CH}_3\\i.\text{CH}_3\text{CH}_2\text{CH}(\text{CH}_3)(\text{CH}_2)_2\text{CH}_3[/tex]
[tex]\displaystyle j.\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}(\text{CH}_3)\text{CH}_2\text{CH}_3[/tex]