First slide

13th group or boron group

Question

The strongest lewis acid among Boron Halides is ,

Moderate

A

${BBr}_{3}$
B

${BI}_{3}$
C

${BCl}_{3}$
D

${BF}_{3}$

Solution

Generally , As the electronegativity increases , Acidic character increases but in case of Boron Halides, ${BI}_{3}$ is most Acidic, i.e, Strongest Lewis acid. This is because there is back donation of electrons from ‘F’ atom to Boron in case of ${BF}_{3}$ . This makes the ${BF}_{3}$ less electron deficient . This tendency of back donation decreases as the size of Halogen atom increases(due to large energy difference).
Hence, is most electron deficient and thus the strongest Lewis acid.

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