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. `CH_(3)-CO OH overset(Br_(2)//P)to(A) overset(NaCN)to(B) overset(HOH//H^(+))to(C)` The product (C) will beA. B. C. D.

Carboxylic acids having at least one `alpha`-hydrogen react with `Cl_(

1.	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. `CH_(3)-CO OH overset(Br_(2)//P)to(A) overset(NaCN)to(B) overset(HOH//H^(+))to(C)` The product (C) will beA. B. C. D.
Answer» Correct Answer - 1 Presence of `alpha`-hydrogen atoms

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