question_answer

                        What is the repeating unit in the condensation polymer obtained by combining \[H{{O}_{2}}CC{{H}_{2}}C{{H}_{2}}COOH\] (succinic acid) and \[{{H}_{2}}NC{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\] (ethylenediamine).                 

Answer:

                The repeating structural unit is obtained by condensing at both ends of both the bifunctional molecules, i.e., succinic acid \[(HOOCC{{H}_{2}}C{{H}_{2}}COOH)\] and ethylenediamine with the elimination of water molecules, i.e., \[-OCC{{H}_{2}}C{{H}_{2}}CO-NHC{{H}_{2}}C{{H}_{2}}NH-\].