In Figure 3, compound A undergoes a nucleophilic substitution reaction to give compound B (stereochemistry not defined). Ph Ph NaOCH they Et NaF Et EL OCH CH3 CH3 A B Figure 3 (0) Discuss a mechanism for the reaction shown in Figure 3. In your answer, include an explanation for your choice of mechanism, as well as a prediction and an explanation of the stereochemical outcome of the reaction. 19 Consider compound A in Figure 3. What effect would changing the fluorine to an iodine have on the rate of reaction? Explain your