Question

Which one of the following compound would undergo hell-volhard-zelinsky reaction and why? (A) Benzoic acid (B) propanoic acid.

Answer 1

Answer:

B) propanoic acid

Explanation:

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Answer 2

Propionic acid will undergo Hell-Volhard-Zelinsky reaction (Option-B).

• H.V.Z, Hell-Volhard-Zelinsky reaction involves the halogenation of carboxylic acids selectively i.e. at the alpha carbon, in the presence of a halogen and red phosphorus as a catalyst.
• Only those carboxylic acids would undergo an H.V.Z reaction that has alpha hydrogen attached to the alpha carbon in their chemical structure.
• In the end, an alpha halo carboxylic acid is formed as a product.
• In propionic acid there are 2 alpha hydrogen at the alpha carbon, hence it will undergo an H.V.Z reaction.

• Benzoic acid does not have any alpha hydrogen, therefore does not undergo an H.V.Z reaction.