Answer:
(i) Both \[Al\]and
\[Tl\]form compounds in +3 state i.e.,
\[T{{l}_{2}}{{O}_{3}},A{{l}_{2}}{{O}_{3}},AlC{{l}_{3}},TlC{{l}_{3}}.\]
(ii) Both \[Al\]and \[Tl\] form octahedral complexes of the
type\[{{[Al{{F}_{6}}]}^{3-}},{{[Tl{{F}_{6}}]}^{3-}}\].
(iii) Like alkali metals, thallium shows (+1) state also; due
to inert pair effect, e.g.,
\[T{{l}_{2}}O,N{{a}_{2}}O\]
\[TlCl,NaCl\]
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