About the use of different molecular representations to predict physical-chemical properties of organic compounds.

The structure of an alkane can not only be represented by the standard mole cular graph, but also through a diversity of other molecular graphs. We sho w that Wiener indexes, determined for any of these molecular graphs, which represent the same molecule, are linear related. Therefore, in relation wit h the application of this index for the prediction of physical-chemical pro perties of the alkanes, the results will be the same, independently of the use of any of these molecular representantions.