Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Hydrolysis rate depends on availability of empty orbitals and polarity of M–Cl bond.

BF₃ < BCl₃: BF₃ is least reactive due to strong back bonding, so it hydrolyses slower.

PCl₃ > PF₃: PCl₃ hydrolyses faster because P–Cl bonds are weaker than P–F bonds.

CCl₄ is least reactive as carbon has no vacant d-orbitals and shows no hydrolysis.

Hence overall correct increasing order matches option (B).