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Solution


Q.

Taking stability as the factor, which one of the following represents correct relationship           [2023]
 
1 AlCl>AlCl3  
2 TlI>TlI3  
3 TlCl3>TlCl  
4 InI3>InI  

Ans.

(2)

As we move down the group, the stability of the +3 oxidation state decreases while that of +1 oxidation state increases. Thus, stability order for +1 oxidation state is Al<Ga<In<Tl and +3 oxidation state is Al>Ga>In>Tl.

Hence, the stability order is, AlCl3>AlCl, TlI>TlI3, TlCl>TlCl3 and InI>InI3.