When 2-iodobutane is treated with a variety of oxyanion bases in DMSO at 50 oC, the percentage of 1-butene formed among total butenes are listed in the following table. Provide an explanation for the trend observed by comparing the basicity of the oxyanion bases. Include any additional structures necessary in your explanation! B ase % 1-Butene in Total Butenes Potassium p-nitrobenzoate 5.8 Potassium benzoate 7.2 Potassium p-aminobenzoate 8.0 Potassium phenoxide 11.4 Sodium 2,2,2-trif luoroethoxide 14.3 Sodium ethoxide 17.1