Chemistry · 2008
NEET 2008 · Prelims · Code A · Q58
The bromination of acetone that occurs in acid solution is represented by this equation. CH_3 COCH_3( aq )+ Br_2( aq ) → CH_3 COCH_2 Br ( aq ) + H^+(…
The bromination of acetone that occurs in acid solution is represented by this equation.
$$\begin{aligned}
& \mathrm{CH}_3 \mathrm{COCH}_3(\mathrm{aq})+\mathrm{Br}_2(\mathrm{aq}) \rightarrow \mathrm{CH}_3 \mathrm{COCH}_2 \mathrm{Br}(\mathrm{aq}) \\
& +\mathrm{H}^{+}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})
\end{aligned}
$$
These kinetic data were obtained for given reaction concentrations.
Initial Concentrations, M
Initial Rate, disappearance of $\displaystyle \mathrm{Br}_2, \mathrm{M} \mathrm{~s}^{-1}$
$$\begin{aligned}
& 5.7 \times 10^{-5} \\
& 5.7 \times 10^{-5} \\
& 1.2 \times 10^{-4} \\
& 3.1 \times 10^{-4}
\end{aligned}
$$
Based on these data, the rate equation is :
| $\displaystyle \left[\mathrm{CH}_3 \mathrm{COCH}_3\right]$ | $\displaystyle \left[\mathrm{Br}_2\right]$ | $\displaystyle \left[\mathrm{H}^{+}\right]$ |
| $\displaystyle 0.30$ | $\displaystyle 0.05$ | $\displaystyle 0.05$ |
| $\displaystyle 0.30$ | $\displaystyle 0.10$ | $\displaystyle 0.05$ |
| $\displaystyle 0.30$ | $\displaystyle 0.10$ | $\displaystyle 0.10$ |
| $\displaystyle 0.40$ | $\displaystyle 0.05$ | $\displaystyle 0.20$ |
Official answer
(2)
Rate $\displaystyle =k\left[\mathrm{CH}_3 \mathrm{COCH}_3\right]\left[\mathrm{H}^{+}\right]$
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