Question:
The reaction:
$ {C2H5OH + SOCl2 ->[{\text{Pyridine}}] C2H5Cl + SO2 + HCl}$ is known as
The reaction:
$ {C2H5OH + SOCl2 ->[{\text{Pyridine}}] C2H5Cl + SO2 + HCl}$ is known as
Updated On: Aug 1, 2022
- Kharasch effect
- Williamson's synthesis
- Darzen's procedure
- Hunsdiecker reaction
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The Correct Option is C
Solution and Explanation
Alkyl halides can be prepared by treating alcohol with $ {SOCl_2}$.
$ {CH_3CH_2OH + SOCl_2 -> CH_3 CH_2 Cl + SO_2 + HCl}$
This reaction is known as Darzen's procedure.
Note : $ {SOBr_2}$ and $ {SOI_2}$ are not used in this reaction because $ {SOBr_2}$ is less stable and $ {SOI_2}$ does not exist.
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Concepts Used:
Preparation of Haloalkanes
- Preparation by Alcohols: By using alcohol, we can very easily prepare Haloalkane as when R-OH is reacted with a suitable reagent it will form R-X. The following reagents will help in the formation of the reactions:
- Halogen Acids (HX)
- Thionyl chloride (SOCl2)
- Phosphorous halides (PX5 or PX3)
- Preparation by Free Radical Halogenation: The formation of alkyl bromides and alkyl chloride is very much possible with the help of free radical halogenation, but as these radicals are highly reactive and non-specific in nature, they can result in the formation of a mixture of products. Though, it's not a preferred method for the preparation of haloalkanes. For example, free radical chlorination can result in the formation of a number of haloalkanes, which in turn makes it difficult to set apart a single product.
- Preparation by Alkenes: An electrophilic addition reaction can be used to transform an alkene into a haloalkane as alkene will react with HX to form R-X.
Read More: Haloalkanes and Haloarenes