Question

Which one of the following is most stable ?

• A. $A{l}^{+}$
• B. $G{a}^{+}$
• C. $I{n}^{+}$
• D. $T{l}^{+}$

Answer 1

The correct option is D $T{l}^{+}$

For boron family, Relative stability of +1 oxidation state progressively increases for heavier elements. Hence $T{l}^{+}$is most stable.