Which is the major organic product from the following reaction?
[tex]\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COH} \frac{\text { 1. } \mathrm{Br}_2, \mathrm{PBr}_3}{2 \cdot \mathrm{H}_3 \mathrm{O}^{+}}[/tex]
CC(Br)C(=O)O
CCC(=O)Br
CCC(O)(Br)CC
O=C(O)CCC(=O)O
CCC(=O)OBr
