<Tr> <Td> Aldehydes </Td> <Td> </Td> <Td> R C--CHO </Td> <Td> </Td> <Td> Acrolein </Td> </Tr> <Tr> <Td> Furans </Td> <Td> 1.5 </Td> <Td> </Td> <Td> </Td> <Td> Furfural </Td> </Tr> <Tr> <Td> Pyrylium salts </Td> <Td> 1.5 </Td> <Td> </Td> <Td> </Td> <Td> Anthocyanins </Td> </Tr>

The c-o bond in carbon monoxide is longer than the c-o bond in carbon dioxide