Based on the proposed mechanism for the reaction ofC 4 H 9 Br in water: Step1: C

Question

Based on the proposed mechanism for the reaction ofC4H9Br in water:

Step1: C4H9Br ® C4H9+   + Br-   (slow)

Step2: C4H9+  + H2O ®  C4H9OH + H+   (fast)

a.      What is the overall reaction?

b.     What is the molecularity of eachstep?       Step1:                        Step2:

c.      Which is the rate determiningstep?

d.     Write the rateequation for the overall reaction.

e.      Write the chemical formula eachspecies that is an intermediate or a catalyst.

Intermediate:

Catalyst:

f.    The overall reaction ofC4H9Br in water is exothermic. Draw an“energy – reaction pathway” diagram based on theabove reaction mechanism.

Explanation / Answer

Given data :                    Step1: C4H9Br  <.........> C4H9+   + Br-   (slow)                     Step2: C4H9+  + H2O  ...........> C4H9OH + H+   (fast) a. Overall reaction is  C4H9Br + H2O  ........> C4H9OH + HBr                   Where k1 is rate constant for forward reaction ,k2 is rate constant for reverse eaction of step 1 and k3 is therate constant for step 3 . ......................... b .    1 , 1 respectively ................... c. step 1 is rate determining step becausse it is theslow step . ................ d .      rate ={k3k1[C4H9Br]}/{k2[Br-]+k3} ......................... e . C4H9+ is intermediate

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