દા.ત. $2S{O_3} + S\xrightarrow{{{{100\,}^o}C}}3S{O_2}$
$5S{O_3} + 2P \to 5S{O_2} + {P_2}{O_5}$
$S{O_3} + 2HBr \to S{O_2} + B{r_2} + {H_2}O$
$PC{l_5}\xrightarrow{\Delta }PC{l_3} + C{l_2}$