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Question

The Lewis acid strength of BBr3,BCl3 and BF3 is in the order

A
< <
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B
< <
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C
< <
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D
< <
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Solution

The correct option is C < <
Order of back bonding
BF3 > BCl3 > BBr3
Back bonding 2p-2p 2p-3p 2p-4p
Stronger is the back bonding weaker the tendency to act as a lewis acid
BF3 < BCl3 < BBr3

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