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The quinone is sulfonated with 20 per cent oleum in the presence of which catalyst?

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The quinone is sulfonated with 20 per cent oleum in the presence of which catalyst?

(a) Mercury sulfate

(b) Magnesium sulfate

(c) Chlorine

(d) Zinc sulphate

The question was posed to me in a job interview.

My query is from Technical Preparations topic in chapter Sulfonation and Sulfation of Unit Processes

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Right answer is (a) Mercury sulfate

The best explanation: Anthraquinone-I-sulfonate (Potassium Salt), the quinone is sulfonated with 20 per cent oleum in the presence of mercury sulfate catalyst.

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