Which of the following statements is not correct

Question

$\begin {array} {1 1} (a)\;\text{Caprolactum is the onomer of nylon6}\\ (b)\;\text{Terylene is a polyester polymer } \\ (c)\;\text{Phenol formaldehyde resin is known as Bakelitte} \\ (d)\;\text{The monomer of Natural rubber is butadiene} \end {array}$