Which among the following monomers is used to prepare Teflon?

1. 
2. $\mathrm{CF}_{2}=\mathrm{CF}_{2}$
3. $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}$
4. $\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}_{2}$

Asked in: MHT CET 2020 (13 Oct Shift 2)

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