Structural formula

A structural formula is the planar representation of a molecular species in which single, double or multiple bonds are indicated by lines between the atoms. In its simplest form, there is no indication or implication of their orientation in space.

Examples

* Structural formula of propane:

 H H H
 | | |
H - C - C - C - H
 | | |
 H H H

* Structural formula of ethylene:

 H H
 | |
 C = C
 | |
 H H