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 \[BC{{l}_{3}}\]
Correct Answer: C
Solution :
\[BC{{l}_{3}}\]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.
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