In some of the reactions,thallium resembles aluminium,whereas in others,it resembles group-$I$ metals. Support this statement by giving some evidence.

(N/A) Thallium $(Tl)$ belongs to group $13$ of the periodic table. The most common oxidation state for this group is $+3$. However,heavier members of this group also display the $+1$ oxidation state due to the inert pair effect.
$1$. Resemblance with aluminium: Like aluminium $(Al)$,thallium forms compounds in the $+3$ oxidation state,such as $TlCl_3$ and $Tl_2O_3$.
$2$. Resemblance with group-$I$ metals: Like alkali metals,thallium forms compounds in the $+1$ oxidation state,such as $Tl_2O$ and $TlCl$. This is due to the stability of the $+1$ oxidation state in thallium caused by the inert pair effect.