All the boron trihalides exceptBI_(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 following reactions is incorrect ?

All the boron trihalides exceptBI_(3) may be prepared by direction bet

1.	All the boron trihalides exceptBI_(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 following reactions is incorrect ?
Answer» `BF_(3)(g) +F^(-)(aq)rarr [BF_(4)]^(-)(aq)` `BCl_(3)(g)+3EtOH(l)toB(OEt)_(3)(l)+3HCL (g)` `BBr_(3)(l)+F_(3)BN(CH_(3))_(3)(s)toBF_(3) (g)+Br_(3)BN(CH_(3))_(3)(s)` `BCl_(3) (g)+2 C_(5)H_(5)N (l)toCl_(3)B(C_(5)H_(5)N)_(2) (s)` Solution :Since `BCl_(3)` can accept only one lone pair hence `Cl_(3)B(C_(5)H_(5)N)_(2)` is not possible.