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p and p Overlap

The correct o...

Question

The correct order of acidity among boron halides is

B F_{3}

B C l_{3}

B B r_{3}

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B C l_{3}

B F_{3}

B B r_{3}

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B B r_{3}

B C l_{3}

B F_{3}

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B C l_{3}

B B r_{3}

B F_{3}

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Solution

The correct option is C $B B r_{3}$ > $B C l_{3}$ > $B F_{3}$
The reason for this trend is that, F atom gives its lone pair of electrons to the vacant p-oribtal of boron, thereby reducing the electropositivity, and hence, the acidity of boron. This is called 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 l}_{3} < {B B r}_{3} < {B F}_{3} < {B C l}_{3}

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

B F_{3}

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