Given above is the mechanism that I drew but my textbook puts it a bit differently. It says that the ethene is dissovled in the concentrated $\ce{H2SO4}$ to form ethyl hydrogen sulphate $\ce{CH3-CH2OSO3H}$ which when diluted with water reacts to form ethanol and the acid $$\ce{CH3CH2OSO3H + H-OH -> CH3CH2OH + H2SO4}$$ So which mechanism is true?
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