The acid-catalyzed reaction of acetone, CH_3COCH_3, with iodine can represented

Question

The acid-catalyzed reaction of acetone, CH_3COCH_3, with iodine can represented by the equation CH_3COCH_3 + I^-_2 rightarrow H + CH_2ICOCH_2 + H^+ + I^-. It is found experimentally that the reaction is first-order with respect to both acetone and the hydrogen ion. The rate of the reaction is independent of the iodine concentration. Which of the following conclusions drawn from the experimental results are incorrect? 1. The uncatalyzed reaction would have a different pathway. 2. Iodine is involved in the rate determining step 3 The reaction takes place stepwise. Select one: a. 1 only b. 2 only c. 3 only d.1 and 3 e.1, 2, and 3

Explanation / Answer

option b.

The incorrect statement is Iodine is involved in rate detertmining step.

It is experimentally found that the reaction is first order with respect to acetone and H+ only.

Thus iodine is not involved in the rate determining as it is not affecting the rate of reaction.

Statement 1 iis correct, as the catayst , changes the pathway of reaction.

Statement 3 is also correct, as this reaction is not an elementary reaction and involves many steps.

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