How is ethylene prepared from ethyl alcohol? Write the reaction.

Explanation

A Methods of preparation of Ethylene:
1. Dehydration of ethyl alcohol : Ethyl alcohol on heating with conc. `H_(2)SO_(4)" at "170^(@)C` gives ethylene.
`underset("Ethyl alcohol")(CH_(3)CH_2OH) underset(170^(@)C)overset("Conc."H_(2)SO_(4))to underset("Ethylene")(C_(2)H_(4)+H_(2)O)`
(2) Dehydration of ethyl halides: Ethyl halides on heating with alcoholic NaOH or KOH give ethylene.
`underset("Ethyl bromide")(CH_(3)CH_(2)Br)+KOH_((alc)) overset(Delta)to H_(2)C=CH_(2)+KBr+H_(2)O `