4. For each of Lewis acids given in Q.3 pick the Lewis base of those given in Q3 which is likely to form the most stable compound with that Lewis acid. For each Lewis acid write out the chemical formula of the compound formed and give a brief explanation of your answer. 5. For each of the following pairs suggest which of the following ions is harder. Explain your answer. a) zinc(iI) or mercury(II) b) potassium(i) or thallium(i) 6. For each of the following pairs suggest which is softer. Explain your answer. (a) MeyP or MeJN (b) amine (NH2)or azide (N3)