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Suggest a route to prepare ethyl hydroge...

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

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When ethanol is heated with conc. `H_2SO_4` at 383 K (i.e. , `110^@` C), ethyl hydrogen sulphate is formed.
`H_2SO_4 to H^(+) + underset"Hydrogen sulphate ion"(.^-OSO_2OH)`

Temperature should not be allowed to rise above 383 K, otherwise diethyl ether will be obtained at 413 K or ethane at 433-443 K.
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