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The least acidic in the series of BF(3),...

The least acidic in the series of `BF_(3),BCl_(3)` and `B Br_(3)` is `BF_(3)` because

A

F is most electronegative

B

F has a small

C

`B^(3+)` has a very small size

D

Back donation of electron from F to B

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