(a) Which of these mechanisms are consistent with the observed rate law? (b) In 1967 J. H. Sullivan showed that this reaction was dramatically catalyzed by light when the energy of the light was sufficient to break the I-I bond in an I, molecule. Which mechanism(s) are consistent with both the rate law and this additional observation? Justify your answer.
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
![The reaction described by
H2(g) + I½(g) → 2 HI(g)
has an experimentally determined rate law of
rate of reaction = k[Hz][I,]
Some proposed mechanisms for this reaction are
given below:
Mechanism a.
(1) H,(g) + I,(g) –4 , 2 HI(g) (one-step reaction)
Mechanism b.
(1) I,(g) 21(g) (fast equilibrium)
(2) H2(g) + 21(g)
→ 2 HI(g) (slow)
Mechanism c.
(1) I,(g) A 21(g) (fast equilibrium)
(2) I(g) + H2(g) 4 H,I(g) (fast equilibrium)
(3) H,I(g) – → HI(g) + I(g) (slow)
(a) Which of these mechanisms are consistent with the
observed rate law?
(b) In 1967 J. H. Sullivan showed that this reaction
was dramatically catalyzed by light when the energy
of the light was sufficient to break the I-I bond in an
I, molecule. Which mechanism(s) are consistent with
both the rate law and this additional observation?
Justify your answer.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F824221f6-ad0d-4f3a-8de1-b824a701df47%2Fb1c8b0d1-04cb-4a19-a4b2-adb64ec7c52c%2F68z2ywm_processed.png&w=3840&q=75)
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