Monomer used to prepare thermocol (styrene)

The same question, asked 2 times: 10 May 2024 S1, 21 Apr 2025 S1. Every wording below, oldest first.

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Question 1
10 May 2024 S1
97 $Which monomer is used to prepare thermocol?$
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Question 2
21 Apr 2025 S1
52 $Which from following compounds the thermo col is obtained?$
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