Write the equations for the preparation of ethyl chloride using Hydrogen halide ethene Thionyl chloride Which of these methods is preferred and why?

Hydrogen halide:\[\ce{\underset{\text{Ethanol}}{CH3CH2 - OH + HCl} ->[anhydrous][ZnCl2] \underset{\text{Ethyl chloride}}{CH3CH2 - Cl} + H2O}\] Ethene:\[\ce{\underset{\text{Ethene}}{CH2 = CH2} + HCl -> \underset{\text{Ethyl chloride}}{CH3 - CH2 - Cl}}\] Thionyl chloride: The preparation of ethyl chloride using thionyl chloride will be the most preferred method.1. Thionyl chloride reacts with straight-chain primary alcohols to give unrearranged alkyl chloride.2. The byproducts (SO2 and HCl) obtained during the course of the reaction are in a gaseous state thus, there is no need to put extra effort for its separation. Hence, this method is preferred for the preparation of ethyl chloride.

Write the equations for the preparation of ethyl chloride using a) Hydrogen halide b) ethene c) Thionyl chloride Which of these methods is preferred and why? - Chemistry

Question

Write the equations for the preparation of ethyl chloride using

Hydrogen halide
ethene
Thionyl chloride

Which of these methods is preferred and why?

Chemical Equations/Structures

Long Answer

Solution

Hydrogen halide:
\[\ce{\underset{\text{Ethanol}}{CH3CH2 - OH + HCl} ->[anhydrous][ZnCl2] \underset{\text{Ethyl chloride}}{CH3CH2 - Cl} + H2O}\]
Ethene:
\[\ce{\underset{\text{Ethene}}{CH2 = CH2} + HCl -> \underset{\text{Ethyl chloride}}{CH3 - CH2 - Cl}}\]
Thionyl chloride:
The preparation of ethyl chloride using thionyl chloride will be the most preferred method.
1. Thionyl chloride reacts with straight-chain primary alcohols to give unrearranged alkyl chloride.
2. The byproducts (SO₂ and HCl) obtained during the course of the reaction are in a gaseous state thus, there is no need to put extra effort for its separation. Hence, this method is preferred for the preparation of ethyl chloride.