Quadruple bond to give a bond order of 2, meaning that there exists a double bond between the two carbons in a dicarbon (C) molecule. The molecular orbital diagram of diatomic carbon would show that there are two pi bonds and no sigma bonds. However, a recent paper by S. Shaik et al. has suggested that a quadruple bond exists in diatomic carbon. Quadruple bond A quadruple bond is a type of chemical bond between two atoms involving eight electrons. This bond is an extension of the more familiar types double bonds and triple bonds. Stable quadruple bonds are most common among
War of the Quadruple Alliance unique example during the eighteenth century when Britain and France were on the same side. It came during a period between 1716 and 1731 when the two countries were allies. Spain would later join with France in the Bourbon Compact, and the two would become enemies of the British once more. War of the Quadruple Alliance The War of the Quadruple Alliance (1717–1720) was a result of the ambitions of Bourbon King Philip V of Spain, his wife, Elisabeth Farnese, and his chief minister Giulio Alberoni to retake territories in Italy lost to the Habsburgs in Vienna, and perhaps even