Describe two methods of preparaton of ethane. Given any three reaction of ethylene with the Heated of preparation of Ethylene:

Explanation

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_(2)OH) underset(170^(@)C)overset("Conc."H_(2)SO_(40))to underset("Ethylene")(C_(2)H_(4)+H_(2)O)`
2). Dehydrohalogenation 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`
Reaction of Ethylene:
Heated with `O_(2)` at high pressure: Polyethylene is formed
`underset("Ethylene")(n(CH_(2)=CH_(2)))to underset("Polythene")(-C_(2)H_(4))-n`