Verified Solution • 2025–26 Session moderate

QAIPMT-2008-Ch-2206: NEET 2008 Chemistry - Class 12 AIPMT-2008-Ch-2206 Solution: The bromination of acetone that occurs in acid solution is…

The bromination of acetone that occurs in acid solution is represented by this equation. CH3COCH3(aq)+Br2(aq)→CH3COCH2Br(aq)+H+(aq)+Br−(aq)CH_3COCH_3(aq)+Br_2(aq)\rightarrow CH_3COCH_2Br(aq)+H^+(aq)+Br^-(aq). These kinetic data were obtained for given reaction concentrations. Initial concentrations, M [CH3COCH3][CH_3COCH_3] [Br2][Br_2] [H+][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 Br2Br_2, Ms−1^{-1}: 5.7×10−55.7\times10^{-5}; 5.7×10−55.7\times10^{-5}; 1.2×10−41.2\times10^{-4}; 3.1×10−43.1\times10^{-4}. Based on these data, the rate equation is

Multiple Choice Options

  • A Rate = k[CH3COCH3][Br2][H+]2k[CH_3COCH_3][Br_2][H^+]^2
  • B Rate = k[CH3COCH3][Br2][H+]k[CH_3COCH_3][Br_2][H^+]
  • C Rate = k[CH3COCH3][H+]k[CH_3COCH_3][H^+]
  • D Rate = k[CH3COCH3][Br2]k[CH_3COCH_3][Br_2]

Step-by-Step Verified Solution

From the first two experiments, it is clear that when concentration of Br 2 is doubled, the initial rate of disappearance of Br 2 remains unaltered. So, order of reaction with respect to Br 2 is zero. The probable rate law for the reaction will be : k[CH 3 COCH 3 ][H + ].

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