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In BF(3),BCl(3) and BBr(3) the stability...

In `BF_(3),BCl_(3) and BBr_(3)` the stability order is

A

`BF_(3)gt BCl_(3)gt BBr_(3)`

B

`BCl_(3)gt BCl_(3) gt BF_(3)`

C

`BBr_(3) gt BF_(3) gt BF_(3)`

D

`BBr_(3)gt BF_(3)gt BCl_(3)`

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The correct Answer is:
A
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All the boron trihalides except BI_(3) may be prepared by direction between the elements. Boron trihalides consist of trigonal-planar BX_(3) molecules. Unlike the halides of the other elements in the group they are monomeric in the gas, liquid and solid states, BF_(3) and BCl_(3) are gases, BBr_(3) is a volatile liquid and BI_(3) is a solid. Boron trihalides are Lewis acids because they form simple Lewis complexes with suitable bases, as in the reaction: BF_(3)(g)+NH_(3)(g)toF_(3)B-NH_(3)(s) However, boron chlorides, bromides and iodides are susceptible (sensitive) to protolysis by mild proton sources such as water, alcohols and even amines, for example BCl_(3) undergoes rapid hydrolysis: BCl_(3)(g)+3H_(2)O(l)toB(OH)_(3)(aq)+3HCl (aq) It is supposed that the first step in the above reaction is the formation of the complex Cl_(3)B larr OH_(2) which then eliminates HCl and reacts with water. Which of the follwoing is the best order of Lewis acid strength of BF_(3),BCl_(3) and BBr_(3) ?

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