Question:

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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Preparation of Haloalkanes

  1. 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:
    1. Halogen Acids (HX)
    2. Thionyl chloride (SOCl2)
    3. Phosphorous halides (PX5 or PX3)
  2. 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.
  3. 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