Which of the following is relatively strong Lewis acid ?

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${BF}_{3}$

${BI}_{3}$

${BBr}_{3}$

${BCl}_{3}$

answer is D.

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Detailed Solution

Among given all boron tri halides, Born Iodide is strong Lewis acid. This is due to the back bonding ability is decreased from F to I. Since electro negativity has been decreased, F can donate electrons to B more easily then Cl ,Br and I. Hence B has more electron deficient in B 3 I Therefore , The increasing order of Lewis acidity of boron halides is ${BF}_{3} < {BCl}_{3} < {BBr}_{3} < {BI}_{3} .$

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