Which of the following is monomer unit of polystyrene? (1) (2) \( -\mathrm{CF}_{2}-\mathrm{CF}_{...

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Which of the following is monomer unit of polystyrene?
(1)
(2) \( -\mathrm{CF}_{2}-\mathrm{CF}_{2}- \)
(3)
(4)
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