Name: Structure of Benzene
Uploaded: 2019-07-19
Duration: 3 min 53 s
Description: Benzene is the most commonly known aromatic compound and is a significant part of gasoline. In this video, we will study the structure and properties of benz...

Question

Describe two methods of preparation of ethylene. Give equation for the reaction of ethylene with the following:

Cold and dil. alk ${KMnO}_{4}$

Accepted Answer

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.

$\underset{Ethyl alcohol}{{CH}_{3} {CH}_{2} OH (l)} \to_{170^{°} C}^{conc . H_{2} {SO}_{4}} \underset{Ethylene}{C_{2} H_{4} (g)} + \underset{Water}{H_{2} O (l)}$

2. Dehydrohalogenation of ethyl halides: Ethyl halides on heating with alcoholic $NaOH or KOH$ give ethylene.

$\underset{Ethyl bromide}{{CH}_{3} {CH}_{2} Br (l)} + \underset{Potassium hydroxide}{KOH (alc)} \overset{Δ}{\to} \underset{Ethylene}{H_{2} C = {CH}_{2} (g)} + \underset{Potassium bromide}{KBr (s)} + \underset{Water}{H_{2} O (l)}$

Reaction of Ethylene:
With cold and dil. alk ${KMnO}_{4}$ : Ethylene on oxidation with cold alkaline ${KMnO}_{4}$ gives ethylene glycol.
The balanced chemical equation is :

$\underset{Ethylene}{3 {CH}_{2} = {CH}_{2} (g)} + \underset{Potassium permanganate}{2 {KMnO}_{4} (aq)} + \underset{Water}{4 H_{2} O (l)} \to \underset{Ethylene glycol}{3 {CH}_{2} {OHCH}_{2} OH (aq)} + \underset{Manganese dioxide}{2 {MnO}_{2} (s)} + \underset{Potassium hydroxide}{2 KOH (aq)}$

Describe two methods of preparation of ethylene. Give equation for the reaction of ethylene with the following:

Cold and dil. alk ${KMnO}_{4}$

Important Questions on Hydrocarbons

Learn and Prepare for any exam you want !

Describe two methods of preparation of ethylene. Give equation for the reaction of ethylene with the following: Cold and dil. alk KMnO4

Important Questions on Hydrocarbons

Learn and Prepare for any exam you want !

Describe two methods of preparation of ethylene. Give equation for the reaction of ethylene with the following:

Cold and dil. alk ${KMnO}_{4}$