$B F_{3}, B C l_{3}, B B r_{3}, B I_{3}$ which has more acidic nature.

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Solution

$B I_{3}$ is more acidic.
The acceptor orbital (empty $p$ -orbital) on boron is involved to a greater extent in $n$ bonding in $B F_{3}, B C l_{3}$ & $B B r_{3}$ .
$B I_{3} > B B r_{3} > B C l_{3} > B F_{3}$ .

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The correct order of Lewis acidity of $B X_{3}$ molecule is

B F_{3} < B C l_{3} < B B r_{3} < B I_{3}

B F_{3}

B C l_{3}

B B r_{3}

B I_{3}

B B r_{3}, B C l_{3}

B F_{3}

B F_{3}, B C l_{3}

B B r_{3}

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