Abstract

Hexagonal chains are a special class of data condensed benzenoid system and phenylene chains are a class of polycyclic aromatic compounds. In this paper, we determine the expected values of the Hyper Zagreb and forgotten topological indices for this class of conjugated hydrocarbons. The comparisons between the expected values of these indices concerning the random phenylene chains have been determined explicitly. The graphical illustrations have been given in terms of the differences between the expected values of these indices.

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