####4. The stability of +1 oxidation state among $Al, Ga$, In and T1 increases in the sequence::[2015 RS]
(a) $Ga<$ In $<Al<Tl$
(b) $Al<Ga<$ In $<Tl$
(c) $Tl<$ In $<Ga<Al$
(d) In $<Tl<Ga<Al$
$ Al<Ga<\ln <Tl $
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