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Chemical Kinetics question

2008 · Q101
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Chemical Kinetics question

2008 · Q101

NEETChemistryChemical KineticsMCQ+4 / −1
The bromination of acetone that occurs in acid solution is represented by this equation.
CH3COCH3(aq) + Br2(aq)  →\to→
     CH3COCH2Br(aq) + H+(aq) + Br−-−(aq)
These kinetic data were obtained for given reaction concentrations.
Initial concentrations, M
[CH3COCH3 [Br2] [H+]
0.30 0.05 0.05
0.30 0.10 0.05
0.30 0.10 0.10
0.40 0.05 0.20

Initial rate, disappearance of Br2, Ms−-−1
5.7×\times×10−-−5
5.7×\times×10−-−5
1.2×\times×10−-−4
3.1×\times×10−-−4

Based on these data, the rate equation is
  1. A
    Rate = k[CH3COCH3][Br2][H+]2
  2. B
    Rate = k[CH3COCH3][Br2][H+]
  3. C
    Rate = k[CH3COCH3][H+]
  4. D
    Rate = k[CH3COCH3][Br2]
View written solutionFree

Correct answer: C

From the first two experiments, it is clear that when concentration of Br2 is doubled, the initial rate of disappearance of Br2 remains unaltered. So, order of reaction with respect to Br2 is zero. The probable rate law for the reaction will be : k[CH3COCH3 ][H+].

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