Which member of group 13 does not exhibit the group valency in its compounds?

Question

Which member of group 13 does not exhibit the group valency in its compounds? (A) Boron (B) Aluminium (C) Gallium (D) Thallium

Tardigrade Admin · Accepted Answer

The usual oxidation state of group 13 is +3, but due to inert pair effect, both the s-electrons of the outer shell remains paired, due to energy considerations in case of thallium. Consequently, Tl show +1 oxidation state.

Q. Which member of group 13 does not exhibit the group valency in its compounds?

Boron

Aluminium

Gallium

Thallium

The usual oxidation state of group 13 is +3, but due to inert pair effect, both the s-electrons of the outer shell remains paired, due to energy considerations in case of thallium. Consequently, Tl show +1 oxidation state.