C_6 H_12 O_6( aq ) +6 O_2( g ) → 6 CO_2( g ) +6 H_2 O_(l). The above reaction is an example of -

$\displaystyle \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6(\mathrm{aq})}+6 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 6 \mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_{2} \mathrm{O}_{(l)}$. The above reaction is an example of -