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Question
State the method of preparation of ethanol by hydrolysis of ethene.
Solution
When concentrated sulphuric acid (conc. H2SO4) is added to ethene at a temperature of 80oC and pressure of 30 atm. ethyl hydrogen sulphate is produced. Ethyl hydrogen sulphate on hydrolysis with boiling water gives ethanol.
\[\ce{C2H4 + H2SO4 ->[80^\circ C][30atm] \underset{Ethene}{C2H5*HSO4}}\]
\[\ce{\underset{sulphate}{\underset{Ethyl hydrogen}{C2H5*HSO4}} + H2O -> \underset{Ethanol}{C2H5OH} + H2SO4}\]
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