Tag: polymer

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Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Teflon (tetrafluoroethylene) is a black material used in non-stick pans for frying chips and vegetables. The oil or butter does not stick at all. In the process of manufacture, one of the technical problems is:

  1. to make teflon stick to the metal of the pan

  2. to make teflon that is non-sticky

  3. to make teflon

  4. to cut a round sheet of teflon that exactly fits
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teflon even when melted do not flow instead it behaves as a gel due to absence of crystalline phase and high melting point so manufactures finds a bit difficulty to make teflon stick to metal of pan.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Identify $X$ in the reaction.


$CHCl _3 \xrightarrow[HF]{SbF _3} CHF _2Cl \overset{1070\, K}{\rightarrow} (X)+2HCl$

  1. $F _2C=CF _2$
  2. $ClFC=CFCl$
  3. $F _2C=CFCl$
  4. $F _2C=CCl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When chloroform is treated with antimony trifluoride and $HF$, 2 chlorine atoms are replaced with 2$ F$ atoms. 


When $\displaystyle CHF _2Cl $ is heated to 1070 K, terafluoroethylene (compound X) is obtained. 

$\displaystyle 2CHF _2Cl \xrightarrow {1070K} F _2C=CF _2 $