We know that CCI4 does not undergo hydrolysis since "C" does not have d orbital. The central atom of all other element contains empty d-orbitals and hence undergoes hydrolysis. As the oxidation state of the central atom increases from +2 (MgCI2) to +3 (AICI3) to +4 (SiCI4) to +5 (PCl5), the extent of hydrolysis increases accordingly. Thus, the overall increasing order of extent of hydrolysis follows the order:
["CCI4 < MgCI2 < AICl3 < SiCl4 < PCl5"]
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