Question
Suggest a route to prepare ethyl hydrogensulphate $\left( CH _3- H _2- OSO _2- OH \right)$ starting from ethanol $\left( C _2 H _5 OH \right)$.
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Answer
Ethanol when treated with sulphuric acid at around $140^{\circ} C$ gives hydrogen sulphate. The reaction takes place as follows.
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