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.
Bush signs North American trade pact Clinton says he won't renegotiate. WASHINGTON -- President Bush signed the North American Free Trade Agreement yesterday, and his successor-in-waiting Bill Clinton immediately announced that he would not seek the treaty's renegotiation.