is a polymer which have monomer units as (a) (b) (c) (d)

79. I. Polymers obtained from word or more different monomers are called copolymers. II. Buna-S is a copolymer. The correct statement(s) is/are (a) Only I (b) Only II (c) Both I and II (d) None of these POLYMERS 9 Copolymers have two or more types of monomers Buna- S is a copolymer. 80. In an isoprene polymer, all the isoprene have (a) cis-1,4 configuration (b) trans-1,4 configuration (c) both (a) and (b) (d) none of these In an isoprene polymer, all the isoprene have cis-1,4- configuration. 81. When the reaction initiates between the phenol and formaldehyde to give bakelite. This initial r