The tendency of BF3, BCI3, and BBr3 to behave as Lew’s acid decreases in the sequence

The tendency of BF₃, BCI₃, and BBr₃ to behave as Lew's acid decreases in the sequence

A
$B F_{3} > B C l_{3} > B B r_{3}$
B
${BCl}_{3} > {BF}_{3} > {BBr}_{3}$
C
${BBr}_{3} > {BCl}_{3} > {BF}_{3}$
D
${BBr}_{3} > {BF}_{3} > {BCl}_{3}$

Solution:

$p π - p π$ back bonding in $B F_{3}$ B is no more electron deficient hence $B F_{3}$ is a weak acid.

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