First slide

13th group or boron group

Question

Correct order of Lewis acid order for Boron halides is

Moderate

A

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

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

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

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

Solution

Due to back bonding tendency in BF₃ is more hence it is less Lewis acid
Back bonding tendency decreases and Lewis acidic strength increases from ${BF}_{3}$ to ${BI}_{3}$

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