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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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AAKASH SERIES-ALKYL AND ARYL HALIDES-EXAMPLES
  1. R-Cl is hydrolysed to R-OH slowly but the reaction is rapid in presenc...

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  2. Optically active 2-iodobutane on treatment with sodium iodide in aceto...

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  3. Expain the formation of the two products in the following reaction : ...

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  4. Why the chlorine atom in vinyl chloride is nonreactive?

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  5. Allyl iodide can be obtained from allyl chloride. Explain.

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  6. Predict the order of reactivity of the following compounds in SN1 and ...

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  7. Write the structures of major and minor products formed when 3-chloro-...

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  8. How do you distinguish between CH3CH = CHCl , CH3CH2Cl and CH2=CH-CH2C...

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  9. In the following pairs of halogen compounds, which would undergo SN2 r...

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  10. Predict the order of reactivity of the following compounds in SN1 and ...

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  11. Which alkyl halide from the following pairs would you expect to react ...

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  12. In the following pairs of halogen compounds, which compound undergoes ...

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  13. Identify A, B, C, D, E, R and R' in the following:

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  14. What is teflon ? How is it prepared ?

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  15. How will you distinguish between chloroform and carbon tetrachloride ?

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  16. How iodoform is distinguished from chloroform?

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  17. Among the three isomeric dichlorobenzenes , which has the highest...

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  18. Which product will form when optically active form of C4H9Br is subje...

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  19. Benzyl chloride undergoes nucleophilic substitution much more easily t...

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  20. Nucleophilic substitution in aryl halides is facilitated by electron w...

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