Molecules with this property bind preferentially to ligands with even hapticity according to the Davies–Green–Mingos rules. An increase in this property due to lone pairs on atoms adjacent to a functional group of interest is described by the alpha effect. (10[1])A reaction between an arene (10[1])and a molecule with this property produces a reactive intermediate called the Meisenheimer complex. (10[1]-5[1])Solvents with this property (10[1]-5[2])react with their solutes in (10[1])solvolysis reactions. (10[1])A leaving group is kicked off an aromatic ring by a molecule with this property (-5[1])in the SNAr (10[1])(“S-N-A-R”) mechanism. (10[2])Inversion of chiral symmetry (10[1])occurs after a “backside attack” (10[1])from (10[1])a molecule with this property (10[3]-5[1])in (-5[1])SN2 reactions. (10[1])For 10 points, (-5[1])name this property of molecules that can donate an electron pair (10[2])to an electrophile. (10[2])■END■ (10[13]0[7])