Question

Plz answer... in Hell-Volhard-Zelinsky reaction, why red phosphorus is used as catalyst???

Answer 1

hlo mate ✌️

for converting crbixylic acid to

acyl bromide

In the mechanism , the carboxylic acid 1st converted to acyl bromide by PBr3 and then convert to alpha bromo carboxylic acid.

Hope it helps

Answer 2

$<p style ="Color:cyan; font-family: cursive; background:black;font size25px;"> Carboxalic acid having an Alpha hydrogen are generated at the Alpha position on treatment with chlorine or bromine in the presence of a small amount of red phosphorus to give alpha hello oxalic acid this reaction is known as Hell volhard zelinsky reaction$