Buna-N is a copolymer of:
AStyrene + acrylonitrile
BButadiene and acrylonitrile (oil-resistant rubber)
CButadiene + ethylene
DStyrene + butadiene
Answer & Solution
Correct answer: B. Butadiene and acrylonitrile (oil-resistant rubber)
Buna-N (NBR): nitrile rubber. Copolymer of butadiene and acrylonitrile. The polar -CN groups make it resistant to oils/fuels. Used in O-rings, fuel hoses, gaskets exposed to petroleum products.
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