3and 5 solve pls

3. Predict the order of proton affinities NR3,NF3,O2,OH,N3. Pick any pair of bases from the following \& explain why you decided that one was stronger than the other. 4. Explain the Bronsted \& Lowry acidity \& basicity of periodic table. 5. Dioxygen O2, is not very good ligand, but it's fairly soft. Hemoglobin contains Fe2+ which is only of borderline softness. i) Suggest how the iron in heme group is softened. ii) CO is poisonous because it bonds more tightly to haemoglobin in RBC than does dioxygen. Why does CO out-compete dioxygen as a ligand