Question

The stability of $BC{l}_3$ is higher as compared to $TIC{l}_3$ is due to

• A. +3 oxidation state of $TI$
• B. +3 oxidation state of $B$
• C. absence of inert pair effect in $BC{l}_3$
• D. presence of inert pair effect in $BC{l}_3$

Answer 1

Answer: (C)

$BC{l}_3$ is stable as compared to $\text{TIC}{\text{l}}_{\text{3}}$ because in $BC{l}_3$ inert -pair effect is absent and due to which B shows +3 oxidation state. On moving down the group, the inert pair effect increases therefore, thallium shows +1 oxidation sate and this oxidation state is more stable than +3 oxidation state.