MHT CET · Chemistry · Carboxylic Acid Derivatives
Which of the following reactions involves \(\alpha\) -halogenation of carboxylic acid?
- A Gattermann reaction
- B Riemer - Tiemann reaction
- C Sandmeyer reaction
- D Hell-Vohlard-Zelinsky reaction
Answer & Solution
Correct Answer
(D) Hell-Vohlard-Zelinsky reaction
Step-by-step Solution
Detailed explanation
Hell Volhard Zelinsky (HVZ) reaction:
This reaction involves alpha bromination of carboxylic acids. Carboxylic acids react with chlorine or bromine in presence of small amount of red phosphorous to give alpha halo carboxylic acids.
\(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\rightarrow} \mathrm{CH}_{3}-\mathrm{CHBr}~-\) \(\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\rightarrow} \mathrm{CH}_{3}-\mathrm{CBr}_{2}-\)
\(\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\longrightarrow}\) No further reaction.
This reaction involves alpha bromination of carboxylic acids. Carboxylic acids react with chlorine or bromine in presence of small amount of red phosphorous to give alpha halo carboxylic acids.
\(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\rightarrow} \mathrm{CH}_{3}-\mathrm{CHBr}~-\) \(\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\rightarrow} \mathrm{CH}_{3}-\mathrm{CBr}_{2}-\)
\(\mathrm{COOH} \stackrel{\mathrm{Br}_{2} / \mathrm{P}}{\longrightarrow}\) No further reaction.
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