Which is strongest Lewis acid?

{B F}_{3}

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B {C l}_{3}

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B {B r}_{3}

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{B I}_{3}

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Solution

The correct option is C ${B I}_{3}$
In ${B F}_{3}$ , boron has a vacant 2p-orbital and each fluorine has fully filled unutilised 2p-orbitals. Fluorine transfers two electrons to vacant 2p-orbital of boron, thus form $p π - p π$ bond (dative or back bonding). This bond reduces the electron deficiency of boron atom, hence its Lewis acid character decreases. The tendency to form back, bonding is maximum in ${B F}_{3}$ and decreases from ${B F}_{3}$ to ${B I}_{3}$ . Thus ${B I}_{3}$ acts as a strongest Lewis acid.

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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 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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