Organic Molecules are always such a hard topic! Make it into a fun puzzle for the kids. This gives hands on learning and you can have them work in groups or as an individual. This is the best way to see your students' misconceptions and confusion about the molecules. I would suggest cutting them out on nice cardstock and laminating so that you can have some nice sets to keep! You could also make it an activity for your students to cut out and keep in their binder.