(a)t-BuF in acidic solution >t-BuF in basic solution(b)t-BuCl>2-chloro 2,3,3 trimethyl butane(c)t-BuCl >2-chloro 1,1,1 trifluro 2-methyl propane(d)t-BuCl in 90% H2O-10% dioxane>t-BuCl in 90% D2O-10% dioxane
