|   With reference to the systematic names, select the correct structures. 
                          
                             
                              |   | 
                             
                             
                              
                                   
                                    |   The 
                                        structure of 3-methylbut-1-ene is 
                                      
                                         | 
                                      | 
                                   
                                  | 
                             
                           
                            
                             
                              |   | 
                             
                             
                              
                                   
                                    |   The 
                                        structure of penta-1,2,3-triene is 
                                      
                                         | 
                                      | 
                                   
                                  | 
                             
                           
                            
                             
                              |   | 
                             
                             
                              
                                   
                                    |   The 
                                        structure of 3-ethyl-2-methylpent-1-ene 
                                        is 
                                      
                                         | 
                                      | 
                                   
                                  | 
                             
                           
                            
                             
                              |   | 
                             
                             
                              
                                   
                                    |   The 
                                        structure of 2,3,4-trimethylpent-2-ene 
                                        is 
                                      
                                         | 
                                      | 
                                   
                                  | 
                             
                           
                            
                             
                              |   | 
                             
                             
                              
                                   
                                    |   The 
                                        structure of ethylpent-2-ene is 
                                      
                                         | 
                                      | 
                                   
                                  | 
                             
                           
                            -- 
                            End -- 
                           |