Question
Group 13 elements show + 1 and + 3 oxidation states. Relative stability of + 3 oxidation state may be given as
A.
$$T{l^{3 + }} > I{n^{3 + }} > G{a^{3 + }} > A{l^{3 + }} > {B^{3 + }}$$
B.
$${B^{3 + }} > A{l^{3 + }} > G{a^{3 + }} > I{n^{3 + }} > T{l^{3 + }}$$
C.
$$A{l^{3 + }} > G{a^{3 + }} > T{l^{3 + }} > I{n^{3 + }} > {B^{3 + }}$$
D.
$$A{l^{3 + }} > {B^{3 + }} > G{a^{3 + }} > T{l^{3 + }} > I{n^{3 + }}$$
Answer :
$${B^{3 + }} > A{l^{3 + }} > G{a^{3 + }} > I{n^{3 + }} > T{l^{3 + }}$$
Solution :
Stability of + 3 oxidation state decreases from $$Al$$ to $$Tl.$$ $$B$$ always shows + 3 oxidation state in all of its compounds.