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The small size and high charge of Al^(3+...

The small size and high charge of `Al^(3+)` ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond.
Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All `BX_(3)` are hydrolysed by water but `BF_(3)` shows a different behaviour.
Which of the following reaction is incorrect ?

A

`BF_(3) (g)+F^(-)(aq) to BF_(4)^(-)`

B

`BF_(3) (g)+2H_(2)Oto[BF_(3)OH]^(-)+H_(3)O^(-)`

C

`BCl_(3)(g)+3EtOH(l)toB(Oet)_(3)(l)+3HCl`

D

`BCl_(3)(g)+2C_(5)H_(5)N(l)toCl_(3)B(C_(5)H_(5)N)_(2)(s)`

Text Solution

Verified by Experts

The correct Answer is:
D
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The small size and high charge of Al^(3+) ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond. Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All BX_(3) are hydrolysed by water but BF_(3) shows a different behaviour. Which of the following statements about anhydrous aluminium chloride is correct ?

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