A) Acetic acid
B) Formic acid
C) Propionic acid
D) 2-methyl propionic acid
Correct Answer: B
Solution :
The aliphatic carboxylic acids containing \[\alpha -\]hydrogen react with\[C{{l}_{2}}\]or\[B{{r}_{2}}\]in the presence of red phosphorus to give\[\alpha -\]haloacids. This reaction is called Hell-Volhard-Zelinsky reaction. \[\overset{\alpha }{\mathop{C}}\,{{H}_{3}}COOH\xrightarrow{C{{l}_{2}},P}\underset{\begin{smallmatrix} monochloroacetic \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,acid \end{smallmatrix}}{\mathop{ClC{{H}_{2}}-COOH}}\,\xrightarrow{C{{l}_{2}},P}\] \[\underset{\begin{smallmatrix} dichloroacetic \\ \,\,\,\,\,\,\,\,\,\,\,\,acid \end{smallmatrix}}{\mathop{C{{l}_{2}}-CH-COOH}}\,\xrightarrow{C{{l}_{2}},P}\underset{\begin{smallmatrix} trichloroacetic \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,acid \end{smallmatrix}}{\mathop{CC{{l}_{3}}-COOH}}\,\] \[HCOOH\]does not give Hell-Volhard Zeiinsky reaction due to absence of\[\alpha -H\]atom.
You need to login to perform this action.
You will be redirected in
3 sec
