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Antigens:  These are the substances which enters into the body and attacks on the immune system and causes harm to the body.  These are the foriegn substances that induce the production of antibodies. However antigens are responsible for the formation of antibodies. Antibodies are produced by the immune system. Antibodies: These are the proteins which are formed by the immune system and kills the harmful foreign substances. Antibodies get activated when any foreign substance enters into the body.  Antigens induce to produce antibodies and both antigens and antibodies fights with each other and either of them gets win. It means if antibodies succed in killing antigens then it causes no harm to the body. And if antigens kills the whole antibodies then it may cause harm to the body. Production of antibodies is depend on the efficiency of our immune system. If the immune system is powerful then more amount of antibodies are produced. Immune system is at the peak level i

         Functional groups          Formulae         1.       Alcohol                                R-OH         2.       Ketone                                 R-CO-R              3.      Aldehyde                              R-CO-H         4.      Carboxylic acid                   R-COOH         5.       Ether                                    R-O-R         6.       Ester                                     R-COO-R         7.       Amides                                 R-CO-NH₂         8.      Cyanides                               CN⁻           9.      Nitriles                                  R-CN        10.     Carboxylate ion                  R-COO⁻        11.     Thiols                                    R-SH        12.     Azide                                       N⁻³         13.     Amines                                  R-NH₂         14.     Imine                                    R₃N⁻         15.     Imide