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# Which of the following is not a step growth polymer?

$\begin {array} {1 1} (a)\;Polybutadiene & \quad (b)\;Nylon-66 \\ (c)\;Glyptal & \quad (d)\;Terelene \end {array}$

Chain-growth polymerization or chain polymerization is a polymerization technique where unsaturated monomer molecules add onto the active site on a growing polymer Poly butadiene is a chain growth polymer
Ans : (a)