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What do we get on direct reaction of SO3 and HCl?

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What do we get on direct reaction of SO3 and HCl?

(a) ClSO3H

(b) ClSO22H

(c) HSO2Cl

(d) None of the mentioned

I had been asked this question during an online interview.

Question is from Chlorosulfonation topic in division Sulfonation and Sulfation of Unit Processes

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The correct option is (a) ClSO3H

To explain I would say: Chlorosulfonic acid is a strong acid, and is written as ClSO3H, this compound is a strong acid, and is therefore usually written ClSO3H, its method of preparation (direct reaction of SO3 and HCl), behaviour at the boiling point (dissociation to SO3 and HCl), and mode of reaction with organic compounds (liberation of HCI and introduction of SO3 ) indicate that it is a compound of SO3 with HCI.

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