a
\(\begin{array}{*{20}{c}} {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_3} - CH - CH - C{H_3}\xrightarrow[\Delta ]{{KO{t_{Bu}}}}} \\ {|}\,\,\,\,\,\,\,\,\, \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,OS{O_2}C{H_3}} \end{array}\)

\(\begin{array}{*{20}{c}} {C{H_3} - CH - CH = C{H_2}} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}\xrightarrow{{{O_3}/{H_2}{O_2}}}\)

\(\begin{array}{*{20}{c}} {C{H_3} - CH - COOH + HCOOH} \\ {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}\)