Class 11
Chemistry :-NCERT Solution - P Block Elements.
Question 2
How can you explain higher stability of BCl3 as compared to TlCl3?
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. BCl3 is more stable than TlCl3 because the +3 oxidation state of B is more stable than the +3 oxidation state of Tl. In Tl, the +3 state is highly oxidising and it reverts back to the more stable +1 state.