eng Ansari Education and Research Society Journal of Ultra Chemistry 0973-3450 2319-8036 May, 2017 13 3 60 64 http://dx.doi.org/10.22147/juc/130301 552 article P. GAYATHRI 1 U. PRIYANKA 1 S. SANDHIYA 2 Department of Mathematics, A.V.C. College (Autonomous) Mannampandal (India) Department of Mathematics, VELS University (India) <p style="text-align: justify;">PI indices for linear Phenylene are obtained by a significant method by considering its edges in various directions and their corresponding number of parallel edges in their molecular graph. In this paper, we obtained the PI index for linear Phenylene for various cases and different structures. The corresponding indices are derived as formulas and also the inferences are tabulated and the values are compared with its structures</p> https://journalofchemistry.org/paper/552/ Molecular Graph Phenylene M-Polynomial Topological indices