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Abstract Let G be a connected graph with vertex set V ( G ) and edge set E ( G ). The Sombor index of G is defined as and the reduced Sombor index of G is defined as where d u denotes the degree of vertex u in G . In this paper, we determine maximum and minimum (reduced) Sombor index of chemical trees with given pendent vertices, and characterize their extremal graphs. In addition, some numerical results are discussed. We calculate the (reduced) Sombor index of a set of benzenoid hydrocarbons. The regression models show that boiling points and (reduced) Sombor index of benzenoid hydrocarbons are highly correlated.
Liu et al. (Thu,) studied this question.