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If a aryl diazonium salt is treated with sulfur dioxide, what product forms?

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in Chemistry – Class 12 by (188k points)
If a aryl diazonium salt is treated with sulfur dioxide, what product forms?

(a) Benzene sulfonic acid

(b) Aryl Sulfonyl Chloride

(c) Thiophenol

(d) Thiophene

I had been asked this question in final exam.

This interesting question is from P-Block Elements topic in chapter P-Block Elements of Chemistry – Class 12

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Correct option is (b) Aryl Sulfonyl Chloride

The best explanation: When aryl diazonium salts are treated with sulfur dioxide in presence of CuCl and acetic acid, it forms aryl sulfonyl chloride Diazonium salts are highly unstable intermediates due to the N≡N^+ bond.

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