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# Which of the following is not a synthetic rubber?

$\begin{array}{1 1}(a)\;\text{Neoprene}&(b)\; \text{Teflon}\\(c)\;\text{Buna-S}&(d)\;\text{Buna-N}\end{array}$

Some common examples of synthetic rubbers are neoprene,buna-S,buna-N,thiokol,silicones etc.
Hence (b) is the correct answer.