C-11-Q265mediumsingle_mcqThe reaction nCH2=CHCl→−(CH2−CHCl)−nn\mathrm{CH_2{=}CHCl} \rightarrow {-}(\mathrm{CH_2{-}CHCl}){-}_nnCH2=CHCl→−(CH2−CHCl)−n is a—aSubstitution reactionbCombustion reactioncPolymerization reactiondAcid-base reaction