Carboxylic acids having at least one `alpha`-hydrogen react with `Cl_(2)` or `Br_(2)` in the presence of phosphorous to give `alpha`-halo acids. The reaction is known as Hell -volhar-Zelinsky reaction (HVZ reaction).
`R-CH_(2)-CO OH overset(P//Br_(2))underset(Delta)toR-CH(Br)CO OH`
The HVZ reaction is limited to the formation of `alpha`-chloro and `alpha`-bromo acids and it is sometimes backward to carry out. the reagents (`X_(2)` and `P`) are noxious and the reaction time is often long and the conditions of reaction are harsh.
Which of the following carboxylic acids will not give HVZ reaction ?
A. `CH_(3)-CO OH`
B. `CH_(3)-overset(CH_(3))overset(|)(CH)-CO OH`
C. `CH_(3)-CH_(2)-CO OH`
D. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-CO OH`
