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Q.

The relative order of Lewis acid character in Boron trihalides is__________

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a

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

b

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

c

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

d

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

answer is C.

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Detailed Solution

due to back bonding in ${BF}_{3}$ , it is weak Lewis acid

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The relative order of Lewis acid character in Boron trihalides is__________