Explain the difference between the Hammett reaction () values for each of these reactions by discussing their reaction mechanisms. In your answer make sure to: - Draw the full reaction mechanism for both reactions A and B - Give the name of the mechanism taking place for each case. - Draw the transition state of the rate determining step - Discuss build-up of charge during the rate determining step Note: In both cases Hammett analysis was performed by varying the substituent X and repeating the nucleophilic reaction A or B many times each