Question

Buna N is a copolymer of

• A. Butadiene & Acrylonitrile
• B. Butadiene & Styrene
• C. Butadiene & Isoprene
• D. Butadiene & Ethylene

Hint:

Buna N is widely used for making oil-resistant rubber products like seals and hoses.

Answer 1

The Correct Option is A

Step 1: Understanding Buna polymers.
Buna rubbers are synthetic rubbers prepared by copolymerization of butadiene with other monomers. The name “Buna” comes from butadiene and sodium (Na), used as a catalyst.
Step 2: Composition of Buna N.
Buna N, also known as nitrile rubber, is produced by copolymerizing butadiene with acrylonitrile. This composition gives the rubber oil and chemical resistance.
Step 3: Analysis of options.
(A) Butadiene & Acrylonitrile: Correct — This combination forms Buna N.
(B) Butadiene & Styrene: Forms Buna S (SBR rubber).
(C) Butadiene & Isoprene: Not Buna N.
(D) Butadiene & Ethylene: Not used for Buna rubbers.
Step 4: Conclusion.
Buna N is a copolymer of butadiene and acrylonitrile, hence option (A) is correct.