Which of the following combinations of monomers correctly represents the building blocks for the synthetic polymer Buna-S?
Correct: B
Buna-S is a synthetic rubber, also known as SBR (Styrene Butadiene Rubber). It is a copolymer formed by the free radical addition polymerization of 1,3-butadiene and styrene. Buna-N (Nitrile Rubber) is formed from 1,3-butadiene and acrylonitrile. Neoprene is poly(chloroprene). Ethylene and propylene form EPDM rubber or polyethylene/polypropylene. Thus, option B correctly identifies the monomers for Buna-S.