        —    
      —C＝H
           ‖
           O
    H—C—H       CHCHCHC—H     CH—O
            ‖                                ‖                           /
            O                                  O                            O—C—H
                                             HO—   ‖
                                                                                         O
                                                                                   
             —               
CH—C—CH  
           ‖
            O
                    
 
                                                                   
           —                                       
                                                                                                
                    —                            —           8—2     
                              
                                                           
                                               
                                             
   
                                                       carbon chain
                                                      carbon ring
                                                                branched chain
                                                             isomerism
                                                                      isomers
                                                             free rotation
                                                       geometric isomers
                                                              optical isomers
                                                     optical isomer ism
                                                              superrim posility
                                                                chirality
                                                         functional group
                                                     non functional group
                                                        saturated compound
                                                      un saturated compound
                                                aliphatic compound
 —                                     aromatic  compound
                                      hydrocarbon
                                                                 alka ne
                                                                 alkyne
                                                                 alkene
                                                               monomer
                                                            polymer
                                                     polymerization
                                                                alcohol
                                                                 ether
                                                                 phenol
                                                                 amine—
                                                 ailaloid—
                                                                    CarboxyliCacid
                                                                      carbonyl group
                                                                            ester 
                                                                        amide
                                                                         aldehyde
                                                                            ketone