Question

Taking stability as the factor, which one of the following represents correct relationship?

• A. Inl3 > Inl
• B. AlCl > AlCl3
• C. TII > TII3
• D. Tll3 > TlCl

Answer 1

Answer: (C)

TII > TII3

Answer 2

The stability of a compound is often related to the charge on the central atom and the nature of its bonding with the ligands. In this case, TII (Tl+1) refers to thallium(I) ions, and TII3 (Tl3+) refers to thallium(III) ions.
Generally, lower oxidation states (e.g., Tl+) are more stable than higher oxidation states (e.g., Tl3+) for heavy elements like thallium. This is due to the presence of additional electron shells that can provide increased shielding and stability for lower oxidation states.
Option (C) TII > TII3 reflects this principle and correctly represents the relationship based on stability.
Therefore, the correct option is (C) : TII > TII3