(A) Buna-$N$ is a synthetic rubber copolymer of $1,3$-butadiene and acrylonitrile. It is highly resistant to the action of petrol,lubricating oil,and

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(A) Buna-$N$ is a synthetic rubber copolymer of $1,3$-butadiene and acrylonitrile. It is highly resistant to the action of petrol,lubricating oil,and organic solvents. Due to these properties,it is extensively used in the manufacturing of oil seals,tank linings,and rubber belts.