Question

The correct increasing order of extent of hydrolysis is

• A. $CCl_{4} < MgCl_{2} < AlCl_{3} < SiCl_{4} < PCl_{5}$
• B. $CCl_{4} < AlCl_{3} < MgCl_{2} < PCl_{5} < SiCl_{4}$
• C. $CCl_{4} < SiCl_{4} < PCl_{5} < AlCl_{3} < MgCl_{2}$
• D. $CCl_{4} < PCl_{5} < SiCl_{4} < AlCl_{3} < MgCl_{2}$

Answer 1

Answer: (A)

Among the given halides, carbon tetrachloride does not undergo hydrolysis readily due to the absence of empty $d$-orbitals. The extent of hydrolysis is proportional to the amount of positive charge present on the central atom, which is prone to attack of $H_{2}O$ molecules.
$CCl_{4} < MgCl_{2} < AlCl_{3} < SiCl_{4} < PCl_{5}$