%0 Journal Article %T F-leap index of some special classes of bridge and chain graphs %J Eurasian Chemical Communications %I Sami Publishing Company (SPC) %Z 2717-0535 %A Mohammed, Mohanad Ali %A Haoer, Raad Sehen %A Robert, Janet %A Chidambaram, Natarajan %A Devadoss, Narasimhan %D 2020 %\ 07/01/2020 %V 2 %N 7 %P 827-833 %! F-leap index of some special classes of bridge and chain graphs %K Leap Zagreb indices %K F-leap index %K bridge %K polyphenyl chain %K spiro chain %R 10.33945/SAMI/ECC.2020.7.10 %X The 2-degree of a vertex v in a (molecular) graph G is the number of vertices which are at distance two from v in G. The F-leap index of a molecular graph G is the sum of cubes of the 2-degree of every vertex v in G. In this research study, we have computed the F-leap index of some special classes of bridges and chain graphs. We also have determined the F-leap index of some chemical structures including polyphenyl chains and spiro chains. %U https://www.echemcom.com/article_107560_e5c6041e9d70a7c630ab2bbf2e8a90b8.pdf