Electronegativity is least for
In IIIA group the least electronegative element is "Al" and highest electronegative element is ''B''.
The electro negativity order is,
B > Tl > In > Ga > Al
Electropositivity order is,
B < Tl < In < Ga < Al
B — Non metal
Al — metal
Ga,In — Metalloid
Tl — metal