Isomerism is the phenomenon whereby certain compounds, with the same molecular formula, exist in different forms owing to their different organisations of atoms. The concept of isomerism illustrates the fundamental importance of molecular structure and shape in organic chemistry.
By signing the nuclear deal, Iran has given up that nuclear umbrella for as long as two decades and made the case for the United States to further strengthen the conventional military capacities of Israel and the GCC.
1 Al Franken says nuclear deal isn't perfect, but he sees it as a strong, necessary agreement. 2  Franken: Iran has incentive to meet its terms; U.S. has strong recourse if Iran does not. 3  U.S. backing out of deal would strengthen Iran's hand, he says.