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Question

SBR (GRS, Buna-S, Cold Rubber) is obtained by a free radical co-polymerisation of:

A
Buta-1,3-diene (70%) and 30% phenyl ethane (styrene)
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B
Chloroprene and styrene
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C
Vinyl acetylene and styrene
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D
Isoprene and 1,3-butadiene
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Solution

The correct option is A Buta-1,3-diene (70%) and 30% phenyl ethane (styrene)
Styrene rubber or SBR (Styrene butadiene rubber) is prepared by the copolymerization of buta - 1,3 - diene (70%) and styrene (30%). The name Buna-S is made up of Bu which indicates Buta - 1,3 - diene, na is for Sodium (Na) and S indicates Styrene.

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