Question

explain lewis acidity of boron hallides

Answer 1

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 . A species which is more electron deficient will electron easily and hence will be more acidic.