Multiple choice Which of the following pairs is not correctly matched? Natural rubber - Isoprene Buna S - Butadiene and styrene Neoprene - Isoprene Orlon - Acrylonitrile Teflon - TFET Reveal answer Fill a bubble to check yourself C Correct answer Explanation Correct answer. Neoprene is a synthetic rubber and is prepared by the polymerisation of chloroprene as monomer unit.