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.
Clinton Signs NAFTA. On December 8, 1993, before President Bill Clinton signed the North American Free Trade Agreement, he delivered a speech about the gains to be made. Prior to its ratification, the agreement, which removes most barriers to trade and investment among the United States, Canada and Mexico, was hotly debated in Congress.