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$\begin{array}{*{20}{c}}
{OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - CH - C{H_2} - C{H_2} - OH}
\end{array}\,$ ${\xrightarrow[{Pyridine{\kern 1pt} cold}]{{Cr{O_3}}}}$ Product
$\text{H}^+(\text{aq})+\text{e}^-\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }\frac{1}{2}\text{H}_2(\text{g});\ \ \ \ \ \text{E}^\ominus_{\text{Cell}}=0.00\text{V}$
$2\text{H}_2\text{O}_{(\text{l})}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }\text{O}_{2(\text{g})}+4\text{H}^{+}_{(\text{aq})}+4\text{e}^-;\ \ \ \ \ \text{E}^0_{\text{Cell}}=1.23\text{V}$
$2\text{SO}^{2-}_{4(\text{aq})}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }\text{S}_2\text{O}^{2-}_{8(\text{aq})}+2\text{e}^-;\ \ \ \ \ \text{E}^0_{\text{cell}}=1.96\text{V}$