alleryBuna-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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