Question

Propionic acid with Br₂ |P yields a dibromo
product. Its structure would be:
Br
।
(a) H-C-CH₂COOH
।
Br

(b) CH₂Br-CH₂-COBr
Br
।
(c) CH₃-C-COOH
।
Br
(d) CH₂Br-CHBr-COOH

Answer 1

            Br

            ।

(c) CH₃-C-COOH

            ।

            Br

Explanation:

Propionic acid with Br2/P will yield a dibromo product. Its structure would be CH₃-C(Br2)-COOH. Carbonylic acids reacts with Cl2 or Br2 in presence of red P to give exclusively α-chloro or α -bromo acids. This reaction is called Hell-Volhard-Zelinsky (HVZ) reduction.

CH3CH2COOH ----Br2/P---> CH3C(Br2)COOH

Option C is the correct answer.