1-Chloro-2-fluoroethylene460-16-2100 % similar 1,2-Dichloroethene156-59-242 % similar trans-1,2-Dichloroethylene156-60-542 % similar 1,2-Dichloroethylene540-59-042 % similar trans-1-Chloropropene16136-85-931 % similar 1-Chloro-1-propene590-21-631 % similar