Question

5) \( Alcl _{3} \) is Mose sbabe where as Ttds is unstade why?

Answer 1

*Due to inert pair effect,as we move down the

13th group ns2 electron remain inert and np1 

electron takes place in the reaction

* so Tl3+ ion is less stable and Tl+1 ion 

is more stable.

* Hence Alcl3 is stable and Tlcl3 is unstable

and decomposes into Tlcl