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What is teflon ? How is it prepared ?...

What is teflon ? How is it prepared ? 

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Teflon is polytetrafluoroethylene. It is prepared by the action of chloroform with antimony trifluoride and hydrofluoric acid, followed by vinyl polymerisation.
`CHCl_3 underset(HF)overset(SbF_3)(rarr)CHF_2Cl underset(-HCl)overset(800^@ C)(rarr)CF_CF_2`
`nCF_2 = CF_2 rarr [-CF_2 - CF_2]_n`.
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