The possible number of isomers increase. There are only two types of butanes but there are 18 variations and 366,319 possible structural isomers. Then the structural isomers may also vary because of the difference in the locations of the double bonds. The second type are called the geometric isomers. They all have the same covalent partnership yet they have a difference in their spatial arrangement.
Geometric isomers occur from the inflexibility of the double bonds, unlike the single bond.
They will not allow the atoms to join geometric isomers that can dramatically affect the biological activities of the organic molecules. The third kind are known as enantiomers. These are molecules that appear to be mirror images of each other. They look like ball and stick figures, where the middle carbon is called an asymmetric carbon. This is because it is attached to four different atoms or groups of atoms.