The compound that does not undergo Hell-Volhard-Zelinsky reaction is:

ethanoic acid

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propionic acid

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iso-butyric acid

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trichloroacetic acid

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Solution

The correct option is D trichloroacetic acid
When carboxylic acids containing an $α - H$ atom are treated with $C l_{2} / B r_{2}$ in the presence of red $P$ , $α - h a l o c a r b o x y l i c$ acids are obtained.

The reaction is called Hell-Volhard-Zelinsky reaction.

Here, it is also clear that this reaction is given by only those compounds that contain at least one $α - H a t o m$ .

Hence, trichloroacetic acid $(C C l_{3} C O O H)$ , due to the absence of $α - H a t o m$ , does not give $H V Z$ reaction.

Option D is correct.

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