1. Consider the three-step mechanism for the reaction of A through intermediates B and C to produce the product D as shown below. Which of the steps is the rate-limiting step? Justify your answer. A B Ea = +15 kcal/mol Ea = +10 kcal/mol C D Ea = +2 kcal/mol AH = +13 kcal/mol AH = +3 kcal/mol = AH = -10 kcal/mol Rate Determining Step Net Enthalpy Change w