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Boron, the first member of group 13 (p-b...

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)`.

Text Solution

Verified by Experts

`BBr_(3)` is maximum acidic because `p pi- p pi` back bonding is the minimum.
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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. Which of the following statements of group 13, the one which is most acidic is:

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. In the reaction: BF_(3)+3LiBH_(4)rarr3liF+X is

The order of acidic strenght boron trihalides is:

Why is BF_(3) a Lewis acid?

The correct order of Lewis acidic strength of boron trihalides :

The unexpected order of acidic strength of the trihalides of boron can best be explained by.

The power of halides of boron to act as Lewis acids decreases in the order

Why boron forms electron deficient compounds?

Knowledge Check

  • The order of acidic strength of boron trihalides

    A
    `BF_(3) lt BCl_(3) lt BBr_(3) lt BI_(3)`
    B
    `BI_(3) lt BBr_(3) lt BCl_(3) lt BF_(3)`
    C
    `BCl_(3) lt BBr_(3) lt BI_(3) lt BF_(3)`
    D
    `BBr_(3) lt BCl_(3) lt BF_(3) lt BI_(3)`

  • The order of acidic strenght boron trihalides is:

    A
    `BF_(3)ltBCl_(3)ltBBr_(3)ltBl_(3)`
    B
    `Bl_(3)ltBBr_(3) ltBCl_(3)ltBF_(3)`
    C
    `BCl_(3)ltBBr_(3)ltBl_(3)ltBF_(3)`
    D
    `BBr_(3)ltBCl_(3)ltBF_(3)ltBl_(3)`

  • The unexpected order of acidic strength of the trihalides of boron can best be explained by.

    A
    `p pi-p pi` beack bonding
    B
    Hybridisation
    C
    Trigonal planar structure
    D
    None of the above