Name: An Introduction to Alkenes
Uploaded: 2019-07-19
Duration: 13 min 14 s
Description: This video tells us about the general properties of alkene compounds, their structures, etc. Let's dive into the video to understand more about this concept.

Question

How ethylene is prepared from ethyl chloride? How can you convert ethylene into Acetylene?

Accepted Answer

When an alkyl halide is refluxed with alcoholic $KOH$ (solution of $KOH$ in ethyl alcohol) solution, a halogen atom ( $X$ ) and a hydrogen atom ( $H$ ) from two adjacent carbon atoms are eliminated in the form of halogen hydracid ( $HX$ ) and result in the formation of an alkene.

Ethyl chloride undergoes dehydrohalogenation in presence alcoholic $KOH$ , ethene is formed.

$\underset{Ethyl Chloride}{{CH}_{3} - {CH}_{2} Cl} \to_{∆}^{Alcoholic KOH} \underset{Ethene}{{CH}_{2} = {CH}_{2}} + HCl + H_{2} O$ .

When an alkene in treated with chlorine or bromine in an inert solvent like carbon tetrachloride, halogens add rapidly to the carbon-carbon double bond to form dihaloalkanes. Iodine reacts very slowly with alkenes, the di-iodide being unstable regenerate alkene.

Ethene on treatment with bromine in carbon tetrachloride, dibromo ethane is formed. The dibromo ethane is treated with alcoholic potassium hydroxide, ethyne is produced.

$\underset{Ethene}{{CH}_{2} = {CH}_{2}} \to_{Room temp .}^{{Br}_{2} / {CCl}_{4}} \underset{Ethene}{{BrCH}_{2} - {CH}_{2}} Br \to_{∆}^{Alcoholic KOH} \underset{Ethyne}{CH \equiv CH} + 2 HBr$ .

How ethylene is prepared from ethyl chloride? How can you convert ethylene into Acetylene?

Important Questions on Unsaturated Hydrocarbons-Alkenes

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