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# Which of the following is a chain-growth polymer?

$\begin{array}{1 1}(a)\;PVC&(b)\; \text{Terylene}\\(c)\;\text{Nylon-66}&(d)\;\text{Nylon-6}\end{array}$

PVC is a polymer of monomer $CH_2=CH-Cl$ vinyl chloride
$-(CH_2-CH-Cl-)_n$
Hence (a) is the correct answer.