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Boron, the first member of group 13 (p-block) is a typical non-metal. H exists in two allotropic forms. The compounds of boron are mainly electron deficient as well as Lewis acids. For example, all the trihalides of boron `(BX_(3))` are Lewis acids. The expected order of acidic strength based on the electro negativity of halogen atoms is : `BF_(3)gtBC l_(3)gtBBr_(3)gtBl_(3)`. But the actual order is the reverse. This is explained with the help of the concept of back bonding `(p pi- p pi)` . Among the hydrides of boron. diborane has a bridged structure. Among the halides of the elements of group 13, the one which is most acidic is:A. `BF_(3)`B. `AlCl_(3)`C. `BCl_(3)`D. `BBr_(3)`. |
| Answer» `BBr_(3)` is maximum acidic because `p pi- p pi` back bonding is the minimum. | |