The order of acidic strength of boron trihalides is:

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

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

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

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

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Solution

The correct option is B $B F_{3} < B C l_{3} < B B r_{3} < B I_{3}$
Boron trihalides are Lewis acid. The order of their acidic strength is as $B F_{3} < B C l_{3} < B B r_{3} < B I_{3}$ . Less acidic nature of $B F_{3}$ is due to $π -$ back bonding.

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Similar questions

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 F_{3}

B C l_{3}

B B r_{3}

B I_{3}

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