試題詳解

19. In an organic solution, an organometallic compound R3MPH3 (R = alkyl, M = metal) decomposes into a hydrocarbon R-R and a new compound RMPH3. The mechanism for the reaction was proposed as follows. The first and third steps are fast, whereas the second step is slow. What is the rate law based on the mechanism?

(A) Rate =(k₁k₃/k-1)R₃MPH₃[PH₃]
(B) Rate = R-R/[R₃M]
(C) Rate = (k₂k1/k-1)[R₃MPH₃]/[PH₃]
(D) Rate = k₂[R₃M]/[PH3]
(E) Rate = k₁[R₃MPH₃]