Tag: polymer

Questions Related to polymer

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:

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

  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

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Correct Option: A
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.

Which monomer is used in preparation of orlon?

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

  1. $CF _2=CF _2$

  2. $CH _2=CH-CN$

  3. $CH _2=CH-Cl$

  4. $CH _2=CH-OH$

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Correct Option: B
Explanation:

Vinyl cyanide $ \displaystyle (CH _2=CH-CN)$ is the monomer that is used in preparation of orlon.

$ \displaystyle nCH _2=CH(CN)  \to [-CH _2-CH(CN)-] _n$.

Hence, the correct option is $B$.


Identify $X$ in the reaction.


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

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

  1. $F _2C=CF _2$

  2. $ClFC=CFCl$

  3. $F _2C=CFCl$

  4. $F _2C=CCl _2$

Show answer
Correct Option: A
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 $