Question 19

In polymer Buna-S, 'S' stands for:

Solution

Buna-S is a synthetic rubber, which is a copolymer of 1,3-butadiene and styrene. The name "Buna-S" is derived as follows:

"Bu" stands for butadiene, "na" stands for sodium (Na) which is used as a catalyst in the polymerisation, and "S" stands for Styrene, the comonomer used along with butadiene.

The correct answer is Option (4): Styrene.

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