JEE Main levelSingle correct optionDifficulty 2 of 3pl167
Buna-S can be classified as
Aan addition copolymer and an elastomer
Ba condensation homopolymer and an elastomer
Ca condensation copolymer and a fibre
Dan addition homopolymer and a thermoset
Answer: A
Buna-S forms by chain growth (addition) of two different monomers, buta-1,3-diene and styrene, so it is a copolymer. Its weak intermolecular forces make it an elastomer.