A) ethanoicacid
B) propionic acid
C) \[iso-\]butyric acid
D) trichloroacetic acid
Correct Answer: D
Solution :
When carboxylic acids containing an \[\alpha -H\]atom are treated with \[C{{l}_{2}}/B{{r}_{2}}\]in the presence of red P, \[\alpha -\]halocarboxylic 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 atleast one \[\alpha -H\]atom. Hence, trichloroacetic acid \[(CC{{l}_{3}}COOH)\] due to the absence of \[\alpha -H\]atom, does not give HVZ reaction.
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