Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Haloalkanes and Haloarenes

Question:

Statement I: Aryl halides can be prepared by reaction of arenes with iodine in the presence of an oxidizing agent

Statement II: Oxidizing agents oxidizes I2 to HI

Options:

Both statement I and statement II are correct and statement II is the correct explanation of statement I

Both statement I and statement II are correct but statement II is not the correct explanation of statement I

Statement I is correct but statement II is false

Statement I is false but statement II is correct

Correct Answer:

Statement I is correct but statement II is false

Explanation:

The answer is actually (3) statement I is correct but statement II is false.

Statement I is correct because aryl halides can be prepared by reaction of arenes with iodine in the presence of an oxidizing agent. The oxidizing agent oxidizes I2 to HI, which is then used to halogenate the benzene ring.

Statement II is false because oxidizing agents do not oxidize I2 to HI. In fact, HI is used to reduce I2 to iodide ions.

The correct explanation for why statement I is correct is that the oxidizing agent creates a more electrophilic environment around the benzene ring, making it more susceptible to halogenation.

Here is the reaction scheme for the preparation of aryl halides from arenes:

\[Ar + I_2 \overset{\text{oxidizing agent}}{------\rightarrow} ArI + HX\]

As you can see, the oxidizing agent is necessary to create a more electrophilic environment around the benzene ring. However, the oxidizing agent does not actually oxidize I2 to HI.

Therefore, statement I is correct but statement II is false.