The overall reaction: 2 A ---> C was found to be first-order with respect to A.
ID: 977776 • Letter: T
Question
The overall reaction: 2 A ---> C was found to be first-order with respect to A. The following reaction mechanism has been proposed for the reaction:
A ---> B + D
B + A ---> E
B + D --->2 C
C + E ---> B
Evaluate the proposed mechanism:
A. The mechanism is plausible
B. The mechanism is not plausible, it does not match the overall reaction
C. The mechanism is not plausible, it models more than three reactants combining
D. The mechanism is not plausible, it does not match the observed rate law
E. The mechanism is not plausible, it has more than three elementary steps
Explanation / Answer
a) The proposed mechanism is plausible
Reason - All the elementary steps add up to give the original reaction. A per the order the first step of the proposed mechanism is the rate determinning step.
None of the compounds viz. B,D and E are part of the rate as is evident from the elementary steps as each one of these cancel out
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