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The reaction:
$$
\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{SOCl}_2 \stackrel{\text { Pyridine }}{\longrightarrow} \mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}+\mathrm{SO}_2+\mathrm{HCl}
$$
is known as
Options:
$$
\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}+\mathrm{SOCl}_2 \stackrel{\text { Pyridine }}{\longrightarrow} \mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}+\mathrm{SO}_2+\mathrm{HCl}
$$
is known as
Solution:
1910 Upvotes
Verified Answer
The correct answer is:
Darzen's procedure
Darzen's method : Alkyl halides are prepared when thionyl chloride and alcohols are refulxed in presence of pyridine.
$$
R-\mathrm{OH}+\mathrm{SOCl}_2 \underset{\text { reflux }}{\stackrel{\mathrm{Py}}{\longrightarrow}} R-\mathrm{Cl}+\mathrm{SO}_2+\mathrm{HCl} \text {. }
$$
Byproducts of this reaction are gases $\left(\mathrm{SO}_2, \mathrm{HCl}\right)$ so can be easily removed from the reaction mixture.
$$
R-\mathrm{OH}+\mathrm{SOCl}_2 \underset{\text { reflux }}{\stackrel{\mathrm{Py}}{\longrightarrow}} R-\mathrm{Cl}+\mathrm{SO}_2+\mathrm{HCl} \text {. }
$$
Byproducts of this reaction are gases $\left(\mathrm{SO}_2, \mathrm{HCl}\right)$ so can be easily removed from the reaction mixture.
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