The Lewis acid strength of BBr3,BCl3andBF3 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