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What is the role of fuming sulphuric acid (oleum) in sulphonation?

Options

  1. ACatalyst
  2. BSolvent
  3. COxidizing agent
  4. DDehydrating agent

Correct answer

D. Dehydrating agent

Step-by-step solution

Fuming sulphuric acid (oleum) acts as a dehydrating agent in the sulphonation process, facilitating the replacement of a hydrogen atom with a sulphonic acid group.

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