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(D) $1$. Teflon $(CF_2=CF_2)$ is formed by addition polymerization,which involves $C-C$ bond formation.$2$. Natural rubber is a polymer of isoprene $(

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Terylene

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(D) $1$. Teflon $(CF_2=CF_2)$ is formed by addition polymerization,which involves $C-C$ bond formation.$2$. Natural rubber is a polymer of isoprene $(CH_2=C(CH_3)-CH=CH_2)$,which involves $C-C$ bond formation.$3$. Terylene is a polyester formed by the condensation of ethylene glycol and terephthalic acid,involving $C-O$ bond formation,but the backbone also contains $C-C$ bonds.$4$. Bakelite is a phenol-formaldehyde resin formed by condensation polymerization. The linkage between phenol units is through methylene $(-CH_2-)$ bridges,involving $C-C$ bond formation between the benzene ring and the methylene group.$5$. However,in the context of condensation polymers like Terylene (polyester) or Nylon (polyamide),the primary linkage formed is $C-O$ or $C-N$ respectively. Among the given options,Terylene is a polyester where the ester linkage $(R-COO-R')$ is formed,primarily involving $C-O$ bond formation during the condensation reaction between the carboxylic acid and the alcohol group.

Which of the following polymers does not involve $C-C$ bond formation during polymerization?

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