Гомологи:
С6H14(гексан) H3C-CH2-CH2-CH2-CH2-CH3
C8H18(окатан) H3C-CH2-CH2-CH2-CH2-CH2-CH2-CH3
C3H8(пропан) H3C-CH2-CH3
Изомеры (у всех формула С7H16):

2,3-диметилпентан                 CH3
                                                  !
                                  H3C-CH-CH-CH2-CH3
                                           !     
                                           CH3


3-этилпентан                                    

H3C-CH2-CH-CH-CH3
                  !
                 С2H5

2,4-диметилпентан                      CH3
                                                      !
                                             H3C-CH-CH2-CH-CH3
                                                                     !
                                                                     CH3

  
2,3,3-триметилбутан
                                                                        CH3
                                                                        !
                                                      H3C-CH - C-CH3
                                                               !        !
                                                              CH3   CH3