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Write Hell Volhard Zelinsky reaction....

Write Hell Volhard Zelinsky reaction.

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In Hell-Volhard-zelinsky reaction (HVZ-reaction) carboxylic acids containing `alpha `-hydrogen arc halogenated in the presence of red phosphorus .
` H_3 C COOH underset(H_2 O) overset(Cl_2 //"Red" P)to Cl.CH_2 COOH +HCl`
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