Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which compounds give the Hell-Yolhard- Zeiinsky reaction? (1)\[C{{H}_{3}}C{{H}_{2}}COOH\] (2) \[C{{H}_{3}}CC{{1}_{2}}COOH\] (3)
(4)\[HCOOH\]
A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
When an acid is heated with bromine or chlorine in presence of phosphorus\[\alpha -\] hydrogen atom of the acid is replaced by halogen atom. This reaction is called Hell-Volhard Zeiinsky reaction. \[C{{H}_{3}}\overset{\alpha }{\mathop{C{{H}_{2}}}}\,COOH+B{{r}_{2}}\xrightarrow[{}]{P}C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{CH}}\,-COOH\]
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