What is the expected product when anisole is treated with chlorosulfonic acid?

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Question: What is the expected product when anisole is treated with chlorosulfonic acid?

Options:

Correct Answer: p-Anisole sulfonic acid

Solution:

Chlorosulfonic acid introduces a sulfonyl group at the para position due to the activating effect of the methoxy group.

What is the expected product when anisole is treated with chlorosulfonic acid?

What is the expected product when anisole is treated with chlorosulfonic acid?

Step 1: Understand what anisole is. Anisole is a compound that has a methoxy group (-OCH3) attached to a benzene ring.
Step 2: Know what chlorosulfonic acid is. Chlorosulfonic acid is a strong acid that can introduce a sulfonyl group (-SO2Cl) to other compounds.
Step 3: Recognize the role of the methoxy group. The methoxy group is an electron-donating group, which activates the benzene ring and directs incoming substituents to the para position.
Step 4: Predict the reaction outcome. When anisole is treated with chlorosulfonic acid, the sulfonyl group will be added to the para position of the benzene ring due to the activating effect of the methoxy group.
Step 5: Conclude the expected product. The expected product is para-methoxybenzenesulfonyl chloride.

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