What is the molecular formula of a monomer used for preparation of teflon?

What is the molecular formula of a monomer used for preparation of teflon?
  1. $\mathrm{C}_2 \mathrm{~F}_4$
  2. $\mathrm{C}_2 \mathrm{H}_2$
  3. $\mathrm{C}_2 \mathrm{H}_4$
  4. $\mathrm{C}_2 \mathrm{H}_3 \mathrm{CN}$

Solution

$\begin{aligned} & \mathrm{nCF}_2=\mathrm{CF}_2 \underset{\text { Heat, pressure }}{\stackrel{\left(\mathrm{NH}_4\right)_2 \mathrm{~S}_2 \mathrm{O}_8}{\longrightarrow}}-\left(\mathrm{CH}-\mathrm{CH}_2\right)_{\mathrm{n}}- \\ & \text { Tetrafluoroethylene } \quad \text { Teflon, m.p.327 }{ }^{\circ} \mathrm{C}\end{aligned}$

Asked in: MHT CET 2022 (06 Aug Shift 2)

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