A form of this property named for a molecule’s Y-shape has been proposed to explain the properties of the guanidinium cation. A variant of a reaction performed on compounds with this property uses a solvent of low-molecular-weight amines instead of ammonia and is named for Benkeser. This property is notably not possessed by the compound C⋅O⋅T, but the dianion (“dye-AN-eye-on”), C-O-T (*) two minus, does have this property. The Friedel-Crafts reaction exemplifies this property’s namesake type of electrophilic substitution, (10[2])during which delocalisation is partially broken. (10[1])To have this property, a compound must have 4n+2 (“four n plus two”) pi-electrons, according to Hückel’s rule. Cyclic compounds with a conjugated pi-system have, for 10 points, what property exemplified by benzene? ■END■