A= metano
                        |   
                     - C -
                        |

B= hexano
                             CH₃ - CH₂ - CH₂ - CH₂ - CH₂ - CH₃

C= propeno        H₂C = CH - CH₃

D= but-1-eno          CH₂= CH - CH₂ - CH₃

E= but-2-ino          CH₃ - CH = CH - CH₃

F= pent-2-ino          CH₃ - C  ||| C - CH₂ - CH₃

G= ciclo-hexano

                     C
                   /     \
                 C      C
                 |        |
                C        C
                   \    /
                     C

H= ciclo-hexeno          

 
                      C
                   //     \
                 C        C
                 |          |
                C         C
                   \      /
                     C