The least electronegative element in boron family is
B
Al
Ga
Tl
As we learnt
Electronegative character of boron family -
The electronegativity in boron family 1st decrease from B to Al and then increases down the group . This is due to the disperencies in the atomic size of the element
Also because of inert pair effect and electronegativity increases down the group after Al , so Al is least negative
Therefore,option (2) is correct.
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