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Q.

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

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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

${BBr}_{3} > {BF}_{3} > {BCl}_{3}$

answer is C.

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Detailed 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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