Which from following polymers is NOT obtained by addition polymerisation method?

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Addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, without the elimination of any small molecules.

1. $[- CH_{2} - CH_{2} -]_{n}$ is polythene, formed by the addition polymerisation of ethene ( $CH_{2} = CH_{2}$ ).

2. $[- CH_{2} - CH (CN) -]_{n}$ is polyacrylonitrile (PAN), formed by the addition polymerisation of acrylonitrile ( $CH_{2} = CH - CN$ ).

3. $[- NH - (CH_{2})_{5} - CO -]_{n}$ is Nylon-6, which is a condensation polymer obtained by heating caprolactam with water at high temperatures.

4. $[- CH_{2} - CH (Cl) -]_{n}$ is polyvinyl chloride (PVC), formed by the addition polymerisation of vinyl chloride ( $CH_{2} = CH - Cl$ ).

Therefore, Nylon-6 is not obtained by addition polymerisation.

Answer:

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