Chemistry - Complete Pblock- Question with Solution | TestHub
Which of the following order is / are incorrect for the rate of hydrolysis :
Options:
Answer:
Solution:
The rate of hydrolysis generally increases with increasing positive charge on the central atom and availability of vacant orbitals. Steric hindrance can decrease the rate.
A. SnCl₂ < SnCl₄: Correct. Sn⁴⁺ has a higher positive charge and is more Lewis acidic than Sn²⁺, leading to faster hydrolysis.
B. SnCl₄ > SnMe₄: Correct. SnCl₄ is covalent and hydrolyzes, while SnMe₄ is stable to hydrolysis due to the absence of polar bonds and vacant orbitals on carbon.
C. AlCl₃ < CCl₄: Incorrect. AlCl₃ hydrolyzes readily due to vacant d-orbitals on Al and its Lewis acidity. CCl₄ does not hydrolyze under normal conditions due to the absence of vacant d-orbitals on carbon and strong C-Cl bonds. Therefore, AlCl₃ > CCl₄.
D. BF₃ < BCl₃: Correct. BCl₃ hydrolyzes faster than BF₃. This is due to the stronger pπ-pπ back-bonding in BF₃ (B-F bond has more double bond character), making the boron less electron-deficient and less susceptible to nucleophilic attack by water.
The final answer is C
