MHT CET202616 April 2026Evening ShiftChemistryPolymersActual
Buna-S is prepared from
Options
- A1, 3- butadiene and vinyl cyanide
- B1, 3- butadiene and styrene
- C1,2 -butadiene and vinyl cyanide
- D1, 2-butadiene and styrene
Correct answer
B. 1, 3- butadiene and styrene
Step-by-step solution
Buna-S is a copolymer synthesized from 1,3 -butadiene and styrene in the presence of sodium as a catalyst. The "Bu" stands for 1,3 -butadiene, "na" stands for sodium, and "S" stands for styrene. The polymerization reaction involves the addition of 1,3 -butadiene and styrene molecules to form the elastomer Buna-S, which is also known as styrene-butadiene rubber (SBR). Answer: 1, 3- butadiene and styrene