vertex-cut sets and tenacity of organic compounds cnh2n+2

Consider some vertices of a graph g are omitted, there are some criteria for measuring the vulnerability of the graph; tenacity is one of them. in the definition of tenacity we use vertex cut s and some items, τ (g − s) and ω(g − s), such that τ (g − s) is the number of vertices in the largest component of g − s and ω(g − s) is the number of components of g − s. in this paper we work on tenacity of organic compound cnh2n+2. the graph of this molecule is a tree. we try on tenacity of it by the definition of the tenacity.