Chemistry-
General
Easy
Question
The small size and high charge of Al3+ 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 Sol. id 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-Sol. vents like benzene while the corresponding boron halides exists as monomer In boron trihalides the extent of back bonding decreases with increase in size of halogens and thus lewis acid character increases All BX3 are hydroly sed by water but BF3 shows a different behavior.
Which one of the following statements is correct ?
- All boron trihalides are hydrolysed to boric acid
- Anhydrous aluminium chloride is an ionic compound
- Aluminium halides make up the electron deficiency by bridging with halide or alkyl groups
- None of these
The correct answer is: Aluminium halides make up the electron deficiency by bridging with halide or alkyl groups
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