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  4. The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using

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Q. The $ -OH $ group of an alcohol or the $ -COOH $ group of a carboxylic acid can be replaced by $ -Cl $ using

ManipalManipal 2007Aldehydes Ketones and Carboxylic Acids

Solution:

The $- OH$ group of alcohol or the $- COOH$ group of a carboxylic acid is replaced by $- Cl$ using phosphorus penta chloride (ie, $PCl _{5}$ )
$\underset{\text { Alcohol }}{ ROH }+ PCl _{5} \longrightarrow RCl + POCl _{3}+ HCl$
$\underset{\text{Acid}}{RCOOH}+ PCl _{5} \longrightarrow RCOCl + POCl _{3}+ HCl
$