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The bromination of acetone that occurs in acid solution is represented by this equation. CH_3 COCH_3(a q)+ Br_2(a q) longrightarrow CH_3 COCH_2 Br(a…

NEET UG 2008 — Chemistry Physical Chemistry

2008mcqeasy

The bromination of acetone that occurs in acid solution is represented by this equation. CH3COCH3(aq)+Br2(aq)⟶CH3COCH2Br(aq)+H+(aq)+Br−(aq)\mathrm{CH}_3 \mathrm{COCH}_3(a q)+\mathrm{Br}_2(a q) \longrightarrow \mathrm{CH}_3 \mathrm{COCH}_2 \mathrm{Br}(a q)+\mathrm{H}^{+}(a q)+\mathrm{Br}^{-}(a q)CH3​COCH3​(aq)+Br2​(aq)⟶CH3​COCH2​Br(aq)+H+(aq)+Br−(aq) These kinetic data were obtained for given reaction concentrations. Initial concentrations, M[CH3COCH3][Br2][H+]Initial rate, disappearance of Br2,Ms−10.300.050.055.7×10−50.300.100.055.7×10−50.300.100.101.2×10−40.400.050.203.1×10−4\begin{array}{|l|} \hline \text {Initial concentrations, } M & \\ \begin{array}{c|l|l|l} {\left[\mathrm{CH}_3 \mathrm{COCH}_3\right]} & {\left[\mathrm{Br}_2\right]} & {\left[\mathrm{H}^{+}\right]} & \text{Initial rate, disappearance of } \mathrm{Br}_2, \mathrm{Ms}^{-1} \\ \hline 0.30 & 0.05 & 0.05 & 5.7 \times 10^{-5} \\ 0.30 & 0.10 & 0.05 & 5.7 \times 10^{-5} \\ 0.30 & 0.10 & 0.10 & 1.2 \times 10^{-4} \\ 0.40 & 0.05 & 0.20 & 3.1 \times 10^{-4} \end{array} \\ \hline \end{array}Initial concentrations, M[CH3​COCH3​]0.300.300.300.40​[Br2​]0.050.100.100.05​[H+]0.050.050.100.20​Initial rate, disappearance of Br2​,Ms−15.7×10−55.7×10−51.2×10−43.1×10−4​​​​ Based on these data, the rate equation is

Official previous-year question

Held on 30 Apr 2008 · Verified 9 Jul 2026.

Options

  1. A

    Rate =k[CH3COCH3][H+]=k\left[\mathrm{CH}_3 \mathrm{COCH}_3\right]\left[\mathrm{H}^{+}\right]=k[CH3​COCH3​][H+]

  2. B

    Rate =k[CH=COCH3][Br2]=k\left[\mathrm{CH}=\mathrm{COCH}_3\right]\left[\mathrm{Br}_2\right]=k[CH=COCH3​][Br2​]

  3. C

    Rate =k[CH3COCH3][Br2][H+]2=k\left[\mathrm{CH}_3 \mathrm{COCH}_3\right]\left[\mathrm{Br}_2\right]\left[\mathrm{H}^{+}\right]^2=k[CH3​COCH3​][Br2​][H+]2

  4. D

    Rate =k[CH3COCH3][Br2][H+]=k\left[\mathrm{CH}_3 \mathrm{COCH}_3\right]\left[\mathrm{Br}_2\right]\left[\mathrm{H}^{+}\right]=k[CH3​COCH3​][Br2​][H+]

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