# Which of the following polymer is a copolymer?

$\begin {array} {1 1} (a)\;polypropelene & \quad (b)\;Nylon-66 \\ (c)\;PVC & \quad (d)\;Teflon \end {array}$

ExplanationCopolymers are formed by combination of two or more different types of monomers
Ans : (b)