Viết các đồng phân của C8H18 và gọi tên.

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1. $C_8H_{18}$ có 18 đồng phân

   1) $CH_3-C(CH_3)_2-C(CH_3)_2-CH_3$

   $\text{2,2,3,3-Tetramethylbutan}$

   2) $CH_3-C(CH_3)_2-CH(CH_3)-CH_2-CH_3$

   $\text{2,2,3-Trimethylpentan}$

   3) $CH_3-C(CH_3)_2-CH_2-CH(CH_3)-CH_3$

   $\text{2,2,4-Trimethylpentan}$

   4) $CH_3-C(CH_3)_2-CH_2-CH_2-CH_2-CH_3$

   $\text{2,2-Đimethylhenxan}$

   5) $CH_3-CH(CH_3)-C(CH_3)_2-CH_2-CH_3$

   $\text{2,3,3-Trimethylpentan}$

   6) $CH_3-CH(CH_3)-CH(CH_3)-CH(CH_3)-CH_3$

   $\text{2,3,4-Trimethylpentan}$

   7) $CH_3-CH(CH_3)-CH(CH_3)-CH_2-CH_2-CH_3$

   $\text{2,3-Đimethylhenxan}$

   8) $CH_3-CH(CH_3)-CH_2-CH(CH_3)-CH_2-CH_3$

   $\text{2,4-Đimethylhenxan}$

   9) $CH_3-CH(CH_3)-CH_2-CH_2-CH(CH_3)-CH_3$

   $\text{2,5-Đimethylhenxan}$

   10) $CH_3-CH(CH_3)-CH(C_2H_5)-CH_2-CH_3$

   $\text{2-Methyl-3-ethylpentan}$

   11) $CH_3-CH(CH_3)-CH_2-CH_2-CH_2-CH_2-CH_3$

   $\text{2-Methylheptan}$

   12) $CH_3-CH_2-C(CH_3)_2-CH_2-CH_2-CH_3$

   $\text{3,3-Dimethylhexan}$

   13) $CH_3-CH_2-CH(CH_3)-CH(CH_3)-CH_2-CH_3$

   $\text{3,4-Dimethylhexan}$

   14) $CH_3-CH_2-CH(C_2H_5)-CH_2-CH_2-CH_3$

   $\text{3-Ethylhexan}$

   15) $CH_3-CH_2-C(CH_3)(C_2H_5)-CH_2-CH_3$

   $\text{3-Methyl-3-ethylpentan}$

   16) $CH_3-CH_2-CH(CH_3)-CH_2-CH_2-CH_2-CH_3$

   $\text{3-Methylheptan}$

   17) $CH_3-CH_2-CH_2-CH(CH_3)-CH_2-CH_2-CH_3$

   $\text{4-Methylheptan}$

   18) $CH_3-CH_2-CH_2-CH_2-CH_2-CH_2-CH_2-CH_3$

   $\text{n-octan}$

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