A real-number to molecular structure mapping is a topological index. It graph invariant method for describing physico-chemical properties of structures specific substances. In that article, We examined pentacene’s chemical composition. The research on the subsequent indices reflected in our paper, we conducted an analysis several including general randic connectivity index, first zagreb sum-con...

The difference of Zagreb indices a graph G is defined as ΔM(G)=∑u∈V(G)(d(u))2−∑uv∈E(G)d(u)d(v), where d(x) denotes the degree vertex x in G. A Halin that results from plane tree T without vertices two and with at least one three such all leaves are joined through cycle C embedded order. In this paper, we establish both lower upper bounds on for general graphs some special fewer inner vertices. ...

The first and second Zagreb indices, since its inception have been subjected to an extensive research in the physio- chemical analysis of compounds. In [6] Hanyuan Deng et.al computed indices four new operations on a graph defined by M. Eliasi, B. Taeri [4]. Motivated from this we define operation graphs compute resultant graph. We illustrate results with some examples.