The solvent dependence of e/sub s//sup -/ reaction rate constants k/sub 2/ and their Arrhenius parameters differ for efficient (nitrobenzene, acetone) and inefficient (phenol, toluene) scavengers. The n-butyl group is so large that 1-butanol is not completely miscible with water. The complex changes of physical properties of 1-propanol/water mixtures produced four different zones of e/sub s//sup -/ behavior on going from 0 to 1.00 mole fraction water. Zone c, 0.75-0.97 mole fraction water, which displays Stokes-Smoluchowski behavior of k/sub 2/, is inaccessible in 1-butanol/water solvents because it is in the immiscible region. In zone a the viscosity normalized rate constant eta k/sub 2/ for inefficient scavengers decreases in spite of the decrease of the electron optical absorption energy E/sub r/. Hydrogen-bonded structures, for example H/sub 2/O(ROH)/sub 8/, apparently make the positive hydrogens on the OH groups less accessible to solvate the electrons and less accessible to protonate S/sup -/.