Question

describe the two process of prepartion of ethylene

Answer 1

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Class 11

CHEMISTRY

ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

Describe two methods of preparation of ethylene . Give equation for the reactions of ethylene with the Heated with `O _(2)` at high pressure

Updated On: 28-8-2021

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Text Solution

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Preparation of enthalene : <br> 1. Dehydrohalogenation of alkyl hallde: When ethyl beomides is heated with alcoholic KOH. Ethylene is formed. <br>

underset("Ethyl bromide") ( CH_(3) CH _(2) Br + KOH) overset( "Alcoholic KOH") to H _(2) C = underset( " Ethylene") ( CH_(2) + KBr + H _(2) O )

<br> 2. Dehydration of ethanol: When ethanol is heated with conc.

H _(2) SO_(4)

at

170^(@)C,

ethylene is obtained. <br>

H - underset( " Ethanol") underset(H) underset(|) overset(H) overset(|) (C) - underset( H) underset(|) overset(OH) overset(|) (C) - H overset(conc. H _(2) SO _(4)) underset(170^(@)C) to underset("Ethylene") ( H _(2) C = CO _(2) + H_(2)O)

<br> Polymerisation: When Ethylene is heated in the presence of

O_(2)

at temperature of

200^(@)C

and highe pressure of

1500 - 2000

atmospheres gives polyethane. <br>

underset( " Ethylene") (n CH _(2) = CH)overset( O _(2) // 200^(@)C) underset( 1500- 2000 atm)tounderset("Polythene") ((C _(2) H _(4)) _(n))