A following mechanism has been proposed for reaction $2 \mathrm{~A}+\mathrm{B} ightarrow…

A following mechanism has been proposed for reaction $2 \mathrm{~A}+\mathrm{B} ightarrow \mathrm{D}+\mathrm{E}$
$\mathrm{A}+\mathrm{B} ightarrow \mathrm{C}+\mathrm{D}($ slow $)$
$\mathrm{A}+\mathrm{C} ightarrow \mathrm{E}$ (fast)
The rate law expression for the reaction is:
  1. $\mathrm{r}=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{~B}]$
  2. $\mathrm{r}=\mathrm{k}[\mathrm{A}][\mathrm{B}]$
  3. $\mathrm{r}=\mathrm{k}[\mathrm{A}]^{2}$
  4. $\mathrm{r}=\mathrm{k}[\mathrm{A}][\mathrm{C}]$

Solution

From slow reaction
Rate $=\mathrm{k}[\mathrm{A}][\mathrm{B}]$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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