Practice Exercises
In each part, make models of both and compare the models to determine the relationship between them as one of the following: constitutional isomers; mirror-image isomers (AKA enantiomers); conformations of the same molecule; unrelated (different molecular formulas); or identical. Remember that constitutional isomers are interconverted by breaking bonds, whereas conformations are interconverted by bond rotation without bond breaking. Also, in order to be conformations, the two structures must be conformations of the same compound; thus, if you have to break and reform bonds to interconvert the two structures, they are isomers (not conformations) since it involves breaking bonds.
CH3 Cl
CH3 CH3
H3C CH3
H3C CH3
CH3 Br