Q26 / 160 · AP EAMCET 2012 · Chemistry

Which one of the following statements is correct for the reaction? Figure

  • A
    Order is two but molecularity is one
  • B
    Order is one but molecularity is two
  • C
    Order is one but molecularity is one
  • Correct answer
    D
    Order is two but molecularity is two

Solution

For the reaction, $\begin{aligned} & \mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5(a q)+\mathrm{NaOH}(a q) \longrightarrow \\ & \mathrm{CH}_3 \mathrm{COONa}(a q)+\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}(a q)\end{aligned}$ the molecularity is two because two molecules are taking part. Moreover, rate law for the reaction is, rate $(r)=k\left[\mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5\right][\mathrm{NaOH}]$ $\therefore$ Order of reaction is $1+1=2$

Hence, the correct answer is option: 'D'.

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