In Polymer Buna - S : 'S' stands for :
Option: 1 Styrene
Option: 2 Sulphonation
Option: 3 Sulphur
Option: 4 Strength
Buna-S is the co-polymer of Buna- 1, 3 diene & styrene.
So, In polymer Buna-S, 'S' stands for styrene.
Therefore, the correct answer is Option (1).
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