<Ul> <Li> C19508 </Li> </Ul> <Tr> <Td> MeSH </Td> <Td> Polyvinyl + Chloride </Td> </Tr> <Tr> <Th_colspan="2"> Properties </Th> </Tr> <Tr> <Td> Chemical formula </Td> <Td> (C H Cl) </Td> </Tr>

Which of the following is the repeating unit in polyvinyl chloride (pvc)