4. When the following molecules are reacted with one mole equivalent of strong Bransted acid, a major protonated species is formed. Draw the structure of this major product and provide a brief explanation for your selected site of protonation. a) b) c) 5. For each pair of compounds below, explain the difference in pKa values. b) c) pKa=17 pKa=5 pKa=14 pKa=1 pKa=2pKa=11 e) f) pKa=17 pKa=0 pKa=12pKa=15