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# Ratio of monomers isobutylene & isoprene used to produce Butyl Rubber

$\begin{array}{1 1}(a)\;90\% : 2\%&(b)\;2\% : 98\%\\(c)\;98\% : 2\%&(d)\;70\% : 30\%\end{array}$

Butyl Rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene.This gives it excellent iimpermeability and the long polyisobutylene segments of its polymer chains give it good flex properties.
Hence (c) is the correct answer.