Bài 25: Ankan

Ankan CH₃-CH(CH₃)-CH(C₂H₅)-CH₃ có tên là 

1. 3,4-đimetylpentan.                                    
2. 2,3-đimetylpentan.
3. 2-metyl-3-etylbutan.                              
4. 2-etyl-3-metylbutan.