Which is the strongest lewis acid among BF3;BCl3;BBr3 and BI3.explain .?

Question

Answer

Strongest Lewis Acid among BF3, BCl3, BBr3, and BI3

Definition of Lewis Acid

Lewis acid is an electron acceptor that can form a covalent bond by accepting a pair of electrons from a Lewis base.

Factors Affecting Lewis Acidity

The following factors affect the Lewis acidity of a compound:

Electronegativity of the central atom

Size of the central atom

Charge on the central atom

Comparing BF3, BCl3, BBr3, and BI3

All of the given compounds are Lewis acids and contain boron as the central atom. As we move down the group, the size of the central atom increases, making it easier for the central atom to accept an electron pair. Therefore, BI3 should be the strongest Lewis acid among the given compounds.

Boron also has an incomplete octet, making it electron deficient and more likely to accept an electron pair. However, the electronegativity of the halogen atoms also plays a role. As we move from F to I, the electronegativity decreases, and the halogen atom becomes less likely to donate its lone pair of electrons. Therefore, the Lewis acidity increases as we move from BF3 to BI3.

Conclusion

BI3 is the strongest Lewis acid among BF3, BCl3, BBr3, and BI3 because of its larger size and lower electronegativity of the halogen atom. The central boron atom is also electron deficient, making it more likely to accept an electron pair.

Answer

BF3 has back bonding which is not possible in others.

this decreases the Lewis acid property of BF3

hence strongest Lewis acid is BI3

Answer

I think it's BI3BI3>BBr3>BCl3>BF3.this trend is due to pie back bonding. All halides have lone pairs, they donate one lone pair to boron by overlapping with the p orbital of boron. Effective overlap between orbital’s decreases due to large size of p orbital of halides.Hence,electron deficiency of boron atom in its halides follow the trend--BI3>,BBr3,>BCL3>BF3 and so it is the Lewis acidity ORDER

Answer

BI3 bcz in bi3 there is min.backbonding btw B and I hence stronger lewis acid

Answer

BF3 because acidic strength decrease down the group

Answer

It will be BI3 becog even back bonding is taking place but due to large energy diff. of B and I it ia unable to accept l.p of electrons.

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