What is the repeating structural unit in polythene polymer ?

The repeating structural unit in neoprene is

How many double bonds are present in the repeating structural units of polythene?

The repeating structural unit in silicone is-

The repeating structural units in silicone is :

The repeating structural unit of silicone is

Draw the structures of the monomers of the following polymers : (i) Teflon (ii) Polythene OR What is the repeating unit in the condensation polymer obtained by combining HO_(2)C CH_(2)CH_(2)CO_(2)H (succinic acid) and H_(2)NCH_(2)CH_(2)NH_(2) (ethylene diamine) ?