Question
How can you explain higher stability of $\mathrm{BCl}_3$ as compared to $\mathrm{TICl}_3$ ?
✓
Answer
Boron and thallium belong to group 13 of the periodic table. In this group, the +1 oxidation state becomes more stable on moving down the group. $\mathrm{BCl}_3$ is more stable than $\mathrm{TICl}_3$ because the +3 oxidation state of B is more stable than the +3 oxidation state of TI . In TI , the +3 state is highly oxidizing and it reverts back to the more stable +1 state.
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