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Chemical Properties of Boron Family

The Lewis aci...

Question

The Lewis acid strength of $B B r_{3}, B C l_{3} a n d B F_{3}$ is in the order

A

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<

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B

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<

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C

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<

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D

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Solution

The correct option is C < <
Order of back bonding
$B F_{3}$ > $B C l_{3}$ > $B B r_{3}$
Back bonding 2p-2p 2p-3p 2p-4p
Stronger is the back bonding weaker the tendency to act as a lewis acid
$B F_{3}$ < $B C l_{3}$ < $B B r_{3}$

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