The structure of propylene is shown. This alkene undergoes addition polymerization to form polypropylenc, a thermoplastic polymer with many different applications. H H C=C H CH3 Draw a segment of polypropylene containing three monomer units connected head-to-tail. Connect each end of the segment with a bond to one of the R groups that are already drawn. The groups represent the connecting carbon atoms in the monomer adjacent to the segment Select Groups More Draw H TM