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  4. What is obtained, when acetic acid is heated with chlorine in presence of red phosphorus?

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Q. What is obtained, when acetic acid is heated with chlorine in presence of red phosphorus?

Delhi UMET/DPMTDelhi UMET/DPMT 2003Aldehydes Ketones and Carboxylic Acids

Solution:

In presence of red phosphorus, acids having a-hydrogen atom give a-substituted acids. This reaction is called Hell-Vollhard Zeiinsky $ (HVZ) $ reaction.
$CH_3COOH + Cl_2 \xrightarrow{\text{Red}P} \underset{\alpha\text{-chloro acetic acid}}{\overset{\underset{|}{C}l}{C}H_2COOH}$