Constitutional(构造)omes Isomers that differ in how their atoms are arranged in chains are called constitutional isomers Compounds other than alkanes can be constitutional isomers of one another They must have the same molecular formula to be isomersConstitutional(构造) Isomers • Isomers that differ in how their atoms are arranged in chains are called constitutional isomers • Compounds other than alkanes can be constitutional isomers of one another • They must have the same molecular formula to be isomers