Which of the following is the strongest Lewis acid?

B I_{3}

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B B r_{3}

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B C l_{3}

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B F_{3}

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Solution

The correct option is B $B I_{3}$
Larger size of halogen atom less is the back donation of electrons into empty $2 p$ orbital of $B$ .
Hence $B I_{3}$ is strongest Lewis acid.

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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 B r_{3}, B C l_{3} a n d B F_{3}

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