JEE Main 2015 Chemistry question
In the presence of a small amount of phosphorous, aliphatic carboxylic acid reacts with chlorine or bromine to yield a reaction in which hydrogen is been replaced by halogen. This reaction is known as
Answer: (4)
Solution
The -halogenation of an aliphatic carboxylic acid by or in the presence of a catalytic amount of red phosphorus is the Hell-Volhard-Zelinsky reaction — option (4). The phosphorus converts a little of the acid into the acid halide, which enolises far more readily than the acid
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