Write a method for the preparation of alkyl halides.

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Solution

$A l c o h o l$ is refluxed with $t h i o n y l c h l o r i d e$ to form $a l k y l c h l o r i d e$ . Gaseous products
$S O_{2} + H C l$ escape out from reaction mixture so that pure $a l k y l h a l i d e$ is obtained. For example, $e t h y l a l c o h o l$ is refluxed with $t h i o n y l c h l o r i d e$ to form $e t h y l c h l o r i d e$ .
$C H_{3} - C H_{2} - O H + S O C l_{2} r e f l u x - ---- \to p y r i d i n e C H_{3} - C H_{2} - C l + H C l ↑ + S O_{2} ↑$

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