Aldehydes Ketones Question 56
Question: In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $ \alpha $ -hydrogen has been replaced by halogen. This reaction is known as:
Options:
A) Wolff- Kishner reaction
B) Rosenmund reaction
C) Etard reaction
D) Hell - Volhard - Zelinsky reaction
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Hell-Volhard-Zelinsky Reaction: It is $ \alpha $ -substitution when a carboxylic acid having $ \alpha $ -hydrogens is treated with chlorine or bromine in presence of small amount of red phosphorous. $ R-CH_2COOH+X_2\xrightarrow{P}R\overset{X}{\mathop{\overset{|}{\mathop{C}}}}H-COOH $
$ +HX(X=Cl,Br) $
BETA
