Suggest a route to prepare ethyl hydrogensulphate `(CH_(3)-CH_(2)-OSO_(2)-OH)` starting from ethanol `(C_(2)H_(5)OH)` .

Explanation

To prepare ethyl hydrogensulphate `(CH3-CH2-OSO2-OH)` starting from ethanol `(C2H5OH)`, we can follow a two-step reaction process involving sulfuric acid `(H2SO4)`. Here’s the step-by-step solution:

### Step 1: Protonation of Ethanol
1. **React ethanol with sulfuric acid**:
- Ethanol `(C2H5OH)` is mixed with concentrated sulfuric acid `(H2SO4)` at a temperature of about 110 degrees Celsius.
- The sulfuric acid dissociates into `H+` and `HSO4-` ions.
- The `H+` ion (proton) from sulfuric acid attacks the oxygen atom of the hydroxyl group in ethanol, leading to the formation of an oxonium ion:
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