For the following three questions, consider the following reaction mechanism: St

Question

For the following three questions, consider the following reaction mechanism:

Step 1 2X + Y ? W + 2Z fast
Step 2 W + Z ? W + U + V slow
Step 3 V + Z ? 2 W + Y fast

5. The intermediates in this reaction are
a. Z and V.
b. X and Y.
c. Y only.
d. W and Y.
e. There are no intermediates in this reaction.


6. The catalysts in this reaction are
a. Z and V.
b. X and Y.
c. Y only.
d. W and Y.
e. There are no catalysts in this reaction.


7. The rate-limiting step in this reaction is Step _____, because _____.
a. 3; the last step is always the rate-limiting step
b. 2; it uses a product of the first step
c. 2; it is the slow step
d. 1; it is bimolecular
e. 1; the first step must occur before any others can occur

Please explain

Explanation / Answer

5. slow step is the rate determining step, and determines the expression for rate constant, so b. X and Y. 6. d. W and Y. as they are not consumed in the reaction. 7. c. 2; it is the slow step

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