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  4. The reaction: C2H5OH + SOCl2 xrightarrow textPyridine C2H5Cl + SO2 + HCl is known as

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Q. The reaction:
$C_2H_5OH + SOCl_2 \xrightarrow{\text{Pyridine}} C_2H_5Cl + SO_2 + HCl$ is known as

AIIMSAIIMS 2002Haloalkanes and Haloarenes

Solution:

Alkyl halides can be prepared by treating alcohol with $SOCl_2$.

$CH_3CH_2OH + SOCl_2 \rightarrow CH_3 CH_2 Cl + SO_2 + HCl$

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.