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a
Tl
b
Al
c
Ga
d
B
answer is B.
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Detailed Solution
In IIIA group the least electronegative element is "Al" and highest electronegative element is ''B''.The electro negativity order is,B > Tl > In > Ga > AlElectropositivity order is,B < Tl < In < Ga < AlB — Non metalAl — metalGa,In — MetalloidTl — metal