The correct order of electronegativity of group 13 elements is
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Electronegativity decreases as you go down a group because atomic size increases, which reduces the ability of the nucleus to attract bonding electrons.
The electronegativity of group 13 elements decreases as we move down the group. B has the highest electronegativity, followed by Al, Ga, In, and Tl. Thus, the correct order is B > Al > Ga > In > Tl.