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 reaction. Uranium bound (-5[1])to this many fluorine atoms has a triple point conveniently close to ambient conditions. A compound with this many carbon atoms exhibits chair and boat conformations. (15[1])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■ (10[4])

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