Chemistry - Polymer Question with Solution | TestHub

To determine which polymer is obtained by condensation polymerisation, let us analyze each option:

1. $[{\text{CF}}_2-{\text{CF}}_2{]}_n$ is Teflon (Polytetrafluoroethylene). It is formed by the addition polymerisation of tetrafluoroethene.

2. $[{\text{CH}}_2-{\text{CH}}_2{]}_n$ is Polythene. It is formed by the addition polymerisation of ethene.

3. $[\text{NH}-({\text{CH}}_2{)}_5-\text{CO}{]}_n$ is Nylon 6. It is synthesized by the ring-opening polymerisation of caprolactam. Since no small molecule is eliminated during the process, it is technically considered an addition polymerisation.

4. The polymer shown in the image is Nylon 6,6, which has the repeating unit $[-\text{CO}-({\text{CH}}_2{)}_4-\text{CO}-\text{NH}-({\text{CH}}_2{)}_6-\text{NH}-{]}_n$. It is formed by the condensation polymerisation of adipic acid and hexamethylenediamine, accompanied by the elimination of water molecules.

Therefore, Nylon 6,6 is the polymer obtained by the condensation polymerisation method.

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