First slide

13th group or boron group

Question

Correct order of Lewis acid order for Boron halides is____?

Moderate

A

$B F_{3} > B C l_{3} > B B r_{3} > B I_{3}$
B

$B F_{3} < B C l_{3} = B B r_{3} < B I_{3}$
C

$B I_{3} > B B r_{3} > B C l_{3} > B F_{3}$
D

$B B r_{3} > B C l_{3} > B I_{3} > B F_{3}$

Solution

As the Back bonding tendency decreases and Lewis acidic strength increases from $B F_{3}$ to $B I_{3}$ . The pure p orbital of B in $B F_{3}$ is not actually empty due to back donation from F atoms via sidewise overlapping.

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