Which of the following reactions will not yield propionic acid ?
\( \mathrm{CH_3CH_2CH_3} + \mathrm{KMnO_4} (\text{Heat}), \ \mathrm{OH^-} / \, \mathrm{H_3O^+} \)
\( \mathrm{CH_3CH_2COOCH_3} + \mathrm{OI^-} / \, \mathrm{H_3O^+} \)
\( \mathrm{CH_3CH_2CCl_3} + \mathrm{OH^-} / \, \mathrm{H_3O^+} \)
\( \mathrm{CH_3CH_2CH_2Br} + \mathrm{Mg}, \ \mathrm{CO_2} \ \text{dry ether} / \, \mathrm{H_3O^+} \)