At higher temperatures, elimination takes place, hence an alkene will be formed.

While at lower temperatures, substitution takes place, hence an ether will be formed.

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temp above 343 gives alkene and below ether

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Dear Amol dave,

This is a simple way of making gaseous alkenes like ethene. If ethanol vapour is passed over heated aluminium oxide powder, the ethanol is essentially cracked to give ethene and water vapour.

For getting an Ether from Ethanol,use two moles of Ethanol with the Oxidising agent Al₂O₃ at 413 K gives Ethoxyethane !

         2 CH₃-CH₂-OH  ----------> CH₃-CH₂-O-CH₂-CH₃ + H₂O

Hope you understood !

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Dear Amol Dave,

 Temp. > 343 K will give alkene, & temp. lower than this will give ether!!!!!

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