Question

How is ethene prepared from ethanol?give the reaction involved in it.

Answer 1

Dehydration of an alcohol means removal of water molecule from it. When ethanol is heated with excess of concentrated sulphuric acid at 170 °c it gets dehydrated to form ethene which is an unsaturated hydrocarbon.
                       conc.H2SO4
CH3-CH2OH  ------------- -------------> CH2=CH2  +H2O
                           dehydation

Answer 2

Heating ethanol at 443 K with excess concentrated sulphuric acid results in dehydration of ethanol to give ethene:-

CH3-CH2OH ------->CH2=CH2 +H2O

 (ethanol)    (H2SO4)     (ethene)

The concentrated sulphuric acid can be regarded as a dehydration agent which remove water from ethanol.

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