a) Acid catalysed reaction may occur through the formation of Vant Hoff or Arrhenius intermediate. A substrate, S(aq) is converted to a product P(aq) through a reaction with an acid catalyst, BH+. Write a general mechanism for the reaction and identify intermediates and the conditions for the formation of each of the intermediates. (4marks)

b) By assuming an appropriate condition, from the mechanism in (a) show that the rate equation for a specific acid catalysed reaction is given by the following equation.

where [ ] [ ][ ] + + = BH B H K , [S]o is the initial concentration of the substrate and k1, k-1, k2 are the rate constants

k.kz [H][S). rate = k [H+]+k_K where K =[B][H*] ,[S], is the initial concentration of the substrate and k1, k-1, [BH] K2 are the rate constants. Dimana K =[B][H*] [S). adalah kepekatan awal substrat dan k1, k-1, k2 adalah [BH] pemalar kadar [6]