Write structural formulas for all of the nine isomers of heptane.
An isomer is a molecule with the same molecular formula as another molecule, but with a different chemical structure. That is, isomers contain the same number of atoms of each element, but have different arrangements of their atoms.Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are two main forms of isomerism.
structural isomerism (or constitutional isomerism) and
stereoisomerism (or spatial isomerism).
The structural formula of a chemical compound is a graphic representation of the molecular structure, showing how the atoms are arranged.
structural formulas provide a complete geometric representation of the molecular structure. For example, many chemical compounds exist in different isomeric forms, which have different enantiomeric structures but the same chemical formula. A structural formula is able to indicate arrangements of atoms in three dimensional space in a way that a chemical formula may not be able to do.