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B
Polythene
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C
Nylon
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D
None of the above
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Solution
The correct option is A Styrene butadiene rubber Copolymers or heteropolymers are polymers formed by two or more different types of monomeric units. Styrene rubber or SBR (Styrene butadiene rubber) is prepared by the copolymerization of buta-1,3-diene (70%) and styrene (30%).
Polyethene and nylon are formed by only one type of monomeric unit. (ethene and caprolactam)