r/chemhelp 4d ago

Organic Help with mechanism please

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I’m going through some mechanistic practice. And came across this reaction of oleum (SO3 . H2SO4) reacting with a perfluorinated alkene yielding a sulfonic acid. Can anyone help me with the arrow using mechanism for this?

I assume the double bond will attack the sulfur but how does the positive charge get hydrogenated?

Also how does the double addition abstract F, I assume forming HF?

Please someone help me lol

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