In conversion from ethanol to ethene, concentrated sulphuric acid is used as:

During the conversion of ethanol into ethene in the presence of con. Sulphuric acid, a molecule of water is lost. In this reaction, con. Sulphuric acid acts as a dehydrating agent. At 170°C ethanol can be dehydrated to give ethene by heating it with an excess of concentrated sulphuric acid. This reaction is called hydration of ethane.

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