Consider the following Boron halides.I) BF3 II) BCl3 III) BBr3 IV) BI3The Lewis acid characters of these halides are such that

The trend is due to π back bonding. All halides have lone pairs, they donate one lone pair to boron by overlapping with the p orbitals of Boron. Effective overlap between orbitals decreases due to large size of p orbitals of halides. Hence electron deficiency of boron atom in its halides follow the trend BI3>BBr3>BCl3>BF3 and so is the Lewis acidity order.

Consider the following Boron halides.I) BF3 II) BCl3 III) BBr3 IV) BI3The Lewis acid characters of these halides are such that

The trend is due to π back bonding. All halides have lone pairs, they donate one lone pair to boron by overlapping with the p orbitals of Boron. Effective overlap between orbitals decreases due to large size of p orbitals of halides. Hence electron deficiency of boron atom in its halides follow the trend BI3>BBr3>BCl3>BF3 and so is the Lewis acidity order.

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Consider the following Boron halides.
I) BF₃ II) BCl₃ III) BBr₃ IV) BI₃
The Lewis acid characters of these halides are such that

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I < II < III < IV

I < III < II < IV

IV < III < II < II

IV < II < III < I

answer is A.

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Detailed Solution

The trend is due to π back bonding. All halides have lone pairs, they donate one lone pair to boron by overlapping with the p orbitals of Boron.
Effective overlap between orbitals decreases due to large size of p orbitals of halides.
Hence electron deficiency of boron atom in its halides follow the trend BI₃>BBr₃>BCl₃>BF₃and so is the Lewis acidity order.

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