The order of p$\mathrm{\pi }$-d$\mathrm{\pi }$  interaction in the compounds containing bond between Si/P/S/Cl and oxygen is in the order:

From Si to Cl in 3rd period, decreasing size increases strength of p$\mathrm{\pi }$-d$\mathrm{\pi }$ bond with oxygen. So the order is,

Si < P < S < Cl