Structural formula

Many chemical compounds, especially hydrocarbons, can exist in different geometric configurations. A structural formula represents the arrangements of atoms in a way that a chemical formula cannot.

One of the advantages with structural formulae is the ability to tell the structure of the compound (see isomer). A simple example of this may be seen with the hydrocarbon butane, C₄H₁₀. The four carbons may be arranged in a linear pattern, or in a branched, "T" pattern. The first arrangement is known as orthobutane, while the second is isobutane.

Molecular formula: C₄H₁₀.

Structural formulae:

A structural formula is named using IUPAC nomenclature.

Ring structure

A ring structure can be drawn in chair perspective.