Maximum number of product(s) obtained in the following is:

$C H_{3} - C O O H e x c e s s B r_{2} / P - ------- \to ?$

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Solution

Carboxylic acids react with chlorine or bromine in presence of small amount of red phosphorus to give alpha halo carboxylic acids.

The reaction is known as Hell-Vohlard -Zelinsky reaction.

In this reaction, the halogenation does not stop at mono halogen stage, di and tri halo derivatives are also obtained.

$C H_{3} - C O O H B r_{2} / P \to B r C H_{2} - C O O H B r_{2} / P \to B r_{2} C H - C O O H B r_{2} / P \to B r_{3} C - C O O H$

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