Question

Which reaction is used for the preparation of $\alpha -$ Bromoacetic acid ?

• A. Kolbe’s Reaction
• B. Reimer-Tiemann Reaction
• C. Hell volhard Zelinsky Reaction
• D. Perkin’s Reation

Answer 1

Answer: (C)

Hell volhard Zelinsky Reaction

When $C{l}_2$ or $B{r}_2$ is react with carboxylic acid in the presence of red phosphorus then $\alpha -$ hydrogen of carboxylic acid

is replaced by $Cl$ or $Br$

$C{H}_{3}COOH\stackrel{B{r}_2}{\to }C{H}_{2}BrCOOH$

Aceticacid $\alpha -$ bromo acetic acid

This reaction is known as Hell Volhard Zelinsky reaction