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Q. Propionic acid with $Br_2/P$ yields a dibromo product. Its structure would be

UP CPMTUP CPMT 2015Aldehydes Ketones and Carboxylic Acids

Solution:

This is Hell-Volhard Zelinsky reaction In this reaction, acid containing $\alpha-H$ react with $X_{2}$ /red $P$ giving product in which the $\alpha$-hydrogens are substituted by $X$.
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