Consider the hypothetical reaction 2 A + B---->2 C + D.The following two-step mechanism is proposed for the reaction:Step 1: A + B--->C + XStep 2: A + X---->C + DX is an unstable intermediate. (a) What is the predictedrate law expression if Step 1 is rate determining? (b) What is the predicted rate law expression if Step 2 is rate determining?(c) Your result for part (b) might be consideredsurprising for which of the following reasons: (i) The concentrationof a product is in the rate law. (ii) There is anegative reaction order in the rate law. (iii) Both reasons(i) and (ii). (iv) Neither reasons (i) nor (ii).

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