energy orbitals. There are 12pelectrons, and so the lowest 5 orbitals are each doubly occu-pied, whereas each of the next 2 orbitals—orbitals of equal energy—is singly occupied.11.14One way to evaluate the relationship between heats of combustion and structure for compounds thatare not isomers is to divide the heat of combustion by the number of carbons so that heats of com-bustion are compared on a “per carbon”basis.As the data indicate (within experimental error), the heats of combustion per carbonof the two aro-matic hydrocarbons, benzene and -annulene, are equal. Similarly, the heats of combustion percarbon of the two nonaromatic hydrocarbons, cyclooctatetraene and -annulene, are equal. Thetwo aromatic hydrocarbons have heats of combustion per carbon that are less than those of thenonaromatic hydrocarbons. On a per carbon basis, the aromatic hydrocarbons have lower potential
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