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Taking stability as the factor, which one of the following represents correct relationship?
A
$TlI>TlI_3$
B
$TlCl_3>TlCl$
C
$InI_3>InI$
D
$AlCl>AlCl_3$
Explanation
Thallium is more stable in the +1 state because of the inert pair effect.
Detailed Solution
$Tl^{+3}$ is less stable than $Tl^{+1}$ (inert pair effect).
Going down group 13, stability of lower oxidation state increases.
In case of B, Al, Ga and In, higher O.S. +3 remains more stable than lower O.S. +1.
But in the last element, thallium (Tl), lower O.S. +1 becomes more stable than higher O.S. +3.