First slide

Atomic and physical properties

Question

The power of halides of boron to act as Lewis acids decreases in the order

Moderate

A

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

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

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

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

Solution

Order of Lewis acid strength of boron halides is
${BI}_{3} > {BBr}_{3} > {BCl}_{3} > {BF}_{3}$
This order is explained on the basis of $pπ - pπ$ back bonding opposite to expected order due to electronegativity

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