Round 8: Tossup 5

A complex with this many members is formed by reacting a diene (“DYE-een”) with a dieno•phile in the Diels–Alder (15[1])reaction. (15[1])Uranium bound to this many fluorine atoms has a (15[1])triple point (15[1])conveniently (15[1])close to ambient conditions. A compound with this many carbon atoms exhibits chair and boat conformations. A compound of sulfur bound to this many fluorine atoms is the most potent (*) greenhouse gas and exhibits octahedral geometry. A vision of an ouroboros led August Kekulé to propose that a compound contained a ring with this many members. The number of carbons in benzene and cyclohexane is, for 10 points, what atomic number of carbon? ■END■

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